Chainmail
From across the universe they came, bringing a ultimatum that could spell the end of New Earth!

Chainmail is a Star Trek: Challenger novel – and the second novel in the Gateways miniseries – written by Diane Carey. Published by Pocket Books, it was first released in .

Summary 
From the book jacket
Dangerous remnants of an extinct interstellar civilization, the Gateways connect the Alpha Quadrant with the farthest reaches of the galaxy. Hidden away in various corners of the universe, the ancient portals could be the future of space travel, but they may also provide a open doorway for an invasion from beyond!

Twenty years ago, in the space near Belle Terre, a caravan of alien vessels disappeared into a gigantic Gateway. Now the descendants of those aliens have returned, armed with incredible new weapons and abilities. Captain Nick Keller of the USS Challenger, already struggling to maintain peace in the troubled sector, must now cope with a fleet of hostile aliens driven by their own fanatical agenda!

Background information 
 To date, this is the only book of the Star Trek: Challenger series produced.
 The conclusion to this story appears in the final novel in the series, What Lay Beyond, as "Exodus".

Characters 
  Captain of the USS Challenger

External link 
 

Novels