Worlds of Star Trek: Deep Space Nine, Volume Two
Worlds of Star Trek: Deep Space Nine, Volume Two: Trill and Bajor is a Pocket DS9 novel – part of the  and the second novel in the Worlds of Star Trek: Deep Space Nine series – written by J. Noah Kym and Michael A. Martin and Andy Mangels. Published by Pocket Books, it was first released in .

Summary 
From the book jacket
Within every federation and every empire, behind every hero and every villain, there are the worlds that define them. In the aftermath of  and in the daring tradition of Spock's World, The Final Reflection, and A Stitch in Time, the civilizations most closely tied to  can now be experienced as never before… in tales both sweeping and intimate, reflective and prophetic, eerily familiar and utterly alien. 

TRILL: They are a people with secrets. For centuries they kept their true nature hidden, even taking disturbing steps to protect the small population of near-immortal symbionts with whom a privileged few Trill are joined, body, mind, and soul. They are a people who hold memory to be sacred, yet deny their own past. Now amid a whirlwind of scandal, accusations, and growing civil unrest, Ezri Dax must penetrate millennia of lies and deceptions, and rediscover what should never have been forgotten, before her civilization rips itself apart.

BAJOR: The honeymoon is over. Following the euphoria of Bajor's marriage to the Federation, the real business of making that union work has begun. But even on a world where politics and religion are intertwined, conflicting visions of Bajor's role in the interstellar arena divide the planet's leadership. As newly minted Captain Kira Nerys sets the tone for the kind of Starfleet officer she will be, First Minister Asarem makes a bold move to define Bajor's voice in the Federation, while the returned Benjamin Sisko prepares for a future that only he, as yet, can see.

"Unjoined" (Trill) 
Ezri Dax, Julian Bashir, Ro Laren, Cardassian doctor Vlu, and Taran'atar are on an expedition on Minos Korva, as this is likely the place where Shakaar Edon was infected with the parasite that led to his assassination. They find no living parasites, but an ancient ceramic shard which is identified as being from a planet called Kurl. Later, they are contacted by Kira Nerys, informing them that Ezri has to fly to the Trill homeworld immediately, as there is political unrest – the population has learned of the parasite crisis and demands answers, and Ezri is to be interviewed about the recent events.

When Ezri, who decided to bring Bashir with her, arrives on Trill, things have gotten worse; there are violent outbreaks and demonstrations all over. Ezri and Bashir meet with Hiziki Gard and General Cyl; Ezri is to testify regarding the parasite crisis, but the situation escalates further when fanatics detonate neurogenic bombs placed around major cities and key symbiont caves, killing hundreds of thousands of joined Trill and unjoined symbionts. Ezri decides to go to the caves of Mak'ala to search for answers, while Bashir is left to take care for the dozens of Trills injured during the violent demonstrations.

In the caves Ezri meets Ranul Keru, a  – and one of the symbionts makes clear that she has to dive deep into the waters to find answers. She does so, and finally arrives at a place where very large and apparently very old symbionts dwell – the Annuated. These beings absorb the memories of all the symbionts that come here to die, and therefore know everything about the development of Trill society. Ezri encounters, and is nearly overwhelmed by, several stored symbiont memories. At one point, Ezri experiences the first joining of a symbiont (named Sef) twenty-five thousand years before, implanted into an ailing villager's post-birth incubation pouch (which both Trill men and women possess) by a Trill healer named Hodak. Hodak had noticed the symbionts, which he called "riverworms," occasionally riding animals and making them stronger, and hoped the symbiont could do the same for the villager.

Ezri then learns that, roughly five thousand years ago, Trill was already a race capable of interstellar travel; at some point they reached the planet Kurl, which proved suitable for both hosts and symbionts. For many years, the Trill outpost there grew, but then an unknown virus killed ten percent of the fifteen million colonists. The Trill of Kurl then engaged in a series of genetic experiments to strengthen the symbionts' immune system, but the alterations resulted in mad symbionts that dominated their hosts instead of merging with them. When the Trill on the homeworld learned of this, an armada was launched to quarantine Kurl and secure the parasites' cooperation in finding a cure for the virus and their madness. The Kurl parasites refused to cooperate and attempted to launch four ships from the planet. After destroying the ships, the leader of the Trill armada concluded that the parasites would continue trying to escape and that genocide was the only viable option for safeguarding Trill. Kurl was then bombarded by biogenic and incendiary weapons, and the remaining four million colonists were believed to have been killed. The Trill people, ashamed of the parasites' creation and the genocide, abandoned space travel. Eventually, a massive cover-up of the events led to the space program and the colony of Kurl being forgotten, as records were destroyed and those with knowledge of the situation were murdered.

Meanwhile, Bashir does his best to help treat the casualties of the bombings. The neurogenic energy of the devices drives the symbionts into shock, and all that he and the other doctors can do is to separate them from their hosts – leaving the latter to die while offering the former a chance to survive. Bashir then remembers the medicine that was used to separate Jadzia from Dax in 2370, which was developed by one Bethan Roa (explored in "Reflections", the Jadzia short story in The Lives of Dax). Against the advice and resistance of his doctor comrades, Bashir applies the drug to one injured joined Trill – thus being able to separate symbiont and host without killing the host.

When the caves of Mak'ala are finally attacked by some violent groups, Cyl is fatally shot; he manages to jump into the water, when an unconscious Ezri appears from deep below with a broken environment suit. In one last act of sacrifice, he fixes her suit by taking vital components from his own, and then drifts down to deposit his memories with the Annuated before dying.

Ezri returns and briefs both Bashir and Trill president Maz on what she learned from the Annuated. The president delivers a planet-wide address in which she shares Ezri's discoveries and also reveals that she has undergone Bashir's new procedure to have the Maz symbiont removed and taken back to Mak'ala. The president also states that as she is now unjoined, her surname is no longer Maz but Durghan. Durghan then announces an indefinite moratorium on new joinings, as only ten percent of the symbionts have survived the bombing and they must be given time to breed and increase their numbers. Current hosts have the option of remaining joined until they die, or undergoing the new unjoining procedure; in either case, the symbiont will then be returned to Mak'ala to breed. Finally, President Durghan announces political reforms that will put more power in the hands of the unjoined.

During their flight back to DS9, Bashir and Ezri have some lengthy talks – by the end of which it becomes clear to both of them that, in light of all the recent events, they both have grown and developed – but not in the same direction. They split, ending their relationship, but both promising to remain friends.

"Fragments and Omens" (Bajor) 
While Benjamin Sisko and Kasidy Yates go on living their life on Bajor with their newborn daughter Rebecca, Jake Sisko feels restless. He finally goes away, wandering around Bajor. During his travels, he meets the artist Korena and falls in love with her. After traveling with her to her home city and overcoming obstacles of her former life, the two marry. When Jake introduces Korena to Ben, he recognizes her as Jake's wife from an alternate timeline (see ). It also becomes clear that Ben knows quite a deal about the future, but he can't express himself properly. Something big is about to come…

On Bajor, a village is completely destroyed. Captain Kira Nerys gives chase to the vessel responsible for the attacks, only to learn that she has been fooled; when the  reaches the ship in the Badlands, they are attacked by Cardassian and Dominion weapons. After beaming on the hostile ship, they find nothing but dead people – and a missing escape pod. On the hostile ship, Hovath is a prisoner of someone he apparently knows – but it remains unclear who she is. Both Hovath and the mysterious woman were not found by Kira's team. Hovath was doing research on the Celestial Temple, and Ro Laren finally realizes that the enemies were after the Orb fragment used to summon the Dal'Rok. It also becomes clear that there must be a mole on DS9, as nobody knew of this and it was only logged in Julian Bashir and Miles O'Brien's personal logs.

Meanwhile, the political situation around Bajor now being in the Federation begins to emerge; Ro proposes the re-establishment of a permanent militia liaison officer on DS9, and Cenn Deska, a Bajoran major is appointed – although reluctant, he finally accepts. Also, prime minister Asarem Wadeen appoints a new Bajoran representative to the Federation council, after the incumbent dies of natural causes – it will be her former husband , a former follower of the Circle (now back for good).

Background information 
 Mangels and Martin's brief for their story was to resolve the connection between the parasitic beings and the Trill; the other elements, such as the loss of the symbionts and the end of Dax and Bashir's relationsip, were their own. Mangels noted that the story was "the most action-packed and grittiest [of all their books], with lots of danger, violence, consequences, and intrigue". ()
 This is the only Star Trek work by author J. Noah Kim. The full story behind the attack on the Bajoran village is revealed in Warpath and Fearful Symmetry.
 Cover art by Geoffrey Mandel, with design by John Vairo, Jr..

Characters

"Unjoined" 
Ezri Dax
Julian Bashir
Dr. Renhol
 Unjoined Trill, serving as , on leave from Starfleet and formerly assigned to 
Keru previously appeared in the  , where he and Lt.  were involved. Keru later became a character in the Star Trek: Titan series, as 's tactical officer and security officer, though he splits the job with Tuvok in The Red King.
 Hiziki Gard  Joined Trill, special agent who shot parasite-infected Shakaar Edon in Lesser Evil
 General Taulin Cyl  joined Trill; the Cyl symbiont was joined with the daughter of Audrid Dax a few decades ago
 Lirisse Maz / Lirisse Durghan  Trill president
 Memh  An ancient Trill symbiont; a "caretaker" of the even more ancient Annuated

"Fragments and Omens" 
Benjamin Sisko  The emissary
Kasidy Yates  The emissary's wife
Jake Sisko  The emissary's son, a storyteller
Korena Sisko  Jake's wife, an artist
Kira Nerys  Captain of DS9
Ro Laren  Security officer of DS9
Elias Vaughn  COO aboard DS9
Asarem Wadeen  Bajoran prime minister
Lenaris Holem  Bajoran general
  Former husband of Asarem Wadeen, now Bajoran representative to the Federation council
Cenn Deska  Bajoran major, now militia liaison officer on DS9
Hovath  Former  – unknown whether he is still alive

References 
  DS9 runabout

External link 

cs:Worlds of Star Trek: Deep Space Nine, Volume 2
de:Trill: Unvereinigt
de:Bajor: Fragmente und Omen
Novels