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  As an old man, Adso, son of the Baron of Melk recounts how, as a young novice in 1327, he joined his mentor, Franciscan friar William of Baskerville on a journey to a Benedictine abbey in Northern Italy where the Franciscans were to debate with Papal emissaries the poverty of Christ. The abbey also boasts a famed scriptorium where scribes copy, translate or illuminate books. The suspicious recent death of the monk Adelmo of Otranto âa young but famous manuscript illuminatorâ has stirred fears among the abbey's inhabitants. The Abbot seeks help from William, known for his deductive powers. Adelmo's death cannot be a suicide because his body was found below a tower with only a window which cannot be opened. William is reluctant, but also drawn by the intellectual challenge and his desire to disprove fears of a demonic culprit. William also fears the abbot will summon officials of the Inquisition if the mystery remains unsolved.
  William soon concludes that Adelmo's death was indeed suicide; he fell from a different tower. Nevertheless, Venantius, a Greek translator âand the last to speak with Adelmoâ is found dead in a vat filled with the blood of slaughtered pigs. The translator's corpse bears a black stain on a finger and his tongue. At a loss, William insists that Adelmo killed himself and that the translator's death can be reasonably explained. The other monks suspect a supernatural cause, fears reinforced when the saintly Fransciscan monk Ubertino of Casale warns that the deaths resemble signs mentioned in the Book of Revelation.
  In the scriptorium, William inspects Adelmo's desk, but is blocked by Brother Berengar, the assistant librarian. Brother Malachia, Head Librarian, denies William access to the rest of the building.
  William encounters Salvatore, a demented hunchback, and his protector, Remigio da Varagine, the cellarer. William deduces that both are former Dulcinians, members of a heretical sect which believed that clergy should be impoverished. William does not suspect Salvatore and Remigio of murder since Dulcinites targeted wealthy Bishops, not poor monks. Nevertheless, Remigio's past gives William leverage in learning the abbey's secrets. Salvatore tells William that Adelmo had crossed paths with Venantius on the night that Adelmo died. Meanwhile, Adso encounters a beautiful semi-feral peasant girl who has apparently sneaked into the abbey to trade sexual favours for food; she seduces him, and he falls in love with her.
  Returning that night to Venantius's desk, William finds a book in Greek, and also a parchment bearing both Greek writing and smudges of a color blended by Adelmo for illuminating books, suggesting another link between Venantius and Adelmo. The parchment also bears cryptic symbols written by a left-handed man using invisible ink. Brother Berengar, having sneaked into the darkened library, distracts William and steals the book and a pair of magnifying glasses that William had been using to read it.
  William suspects that Berengar is the crucial piece of the puzzle, but the abbey's herbalist informs William that Berengar has been found dead, drowned in a bath and bearing stains similar to those seen on Venantius. The herbalist finds William's magnifying glasses nearby, but not the Greek book Berengar had taken. William confronts the Abbot with the parchment found in the scriptorium, proving its links to Venantius and Adelmo andâsince Berengar was the only left handed man in the abbey, the assistant librarian as well. William insists that the parchment proves a humanâand not demonicâcause for the deaths, and demands access to the library. William theorizes that the translator transcribed the Greek notes on the parchment from a book he had been reading, and that the now missing book had been read by each of the dead men and was somehow responsible for their deaths.
  The Abbot is unconvinced and insists that William end his investigations. Burning the parchment, the Abbot informs William that the Inquisition âin the person of Bernardo Guiâ has already been summoned.
  Determined to solve the mystery before the Inquisition arrives, William and Adso again enter the library and discover a vast, hidden library above the scriptorium. A lover of knowledge, William is overjoyed. William suspects the abbey of keeping the books hidden because so much of their knowledge comes from pagan philosophers and cannot be reconciled with Christianity.
  William tells Adso that he and Bernardo Gui have crossed paths before, years earlier, when William was an inquisitor. Like the Abbot, the Benedictine monks and even William's fellow Franciscans, Gui settles on the devil as the culprit. Soon after arriving, Gui finds Salvatore and the peasant girl fighting over a black cockerel while in the presence of a black cat. For Gui, this is irrefutable proof of witchcraft, and he tortures Salvatore into a false confession.
  As the theological debate begins, the abbey's herbalist finds a book written in Greek in his dispensary, and is overheard telling this to William. Soon, the herbalist is found murdered in the now ransacked dispensary.
  Learning Remigio's Dulcanite past, Gui arrests him for the murders. With Salvatore and the peasant girl, Remigio is brought before a tribunal for which Gui, the Abbot and also Willam will be judges, Gui having recognized William. At his trial, Remigio proudly admits his pastâwhich included killing bishops and priestsâbut denies having killed anyone in the abbey. While the Abbot quickly condemns Remigio for murder, William does not, pointing out that the murders are tied to a book written in Greek, which Remigio cannot read. William warns that Remigio's death won't end the string of deaths that have plagued the abbey. Under Gui's threats of torture, Remigio "confesses". Gui arranges for the prisoners to be burned at the stake, while William, having "relapsed", will be taken to Avignon.
  Soon Brother Malachia is seen dying, also having black stains on his tongue and finger, as William had predicted. Gui turns suspicion toward William, telling the monks that William's prior knowledge of the murder makes him the natural suspect. As the monks prepare Gui's prisoners at the stake, William and Adso re-enter the secret library, and there, they come face to face with the Venerable Jorge, the most ancient denizen of the abbey. Having recognized the lines on the translator's parchment, William demands that Jorge turn over the book that the dead men had been readingâAristotle's Second Book of Poetics on Comedy. Jorge reveals that William's theories were correct, and "rewards" him by presenting him with a copy of the book, likely the only surviving copy, the existence of which Jorge had vehemently denied earlier. William realizes that the corners of each page are coated with poison, and monks turning its pages, touch both the corner and their own tongues. Believing laughter to be sinful, Jorge has poisoned the pages: those reading the book would unwittingly ingest the poison. Confronted, Jorge starts a blaze that quickly engulfs the library. William insists that Adso flee, as he vainly tries to save the books. Jorge kills himself by consuming the poison-coated pages. Most of the books, including the last volume of Poetics, are lost.
  Seeing the fire, the monks abandon the burning of Gui's prisoners, allowing the local peasants to save the girl and turn on Gui. Gui is killed when his wagon tumbles off a cliff. William and Adso later take their leave of the Abbey. On the road, Adso is stopped by the girl, silently appealing for him to stay with her, but Adso continues on with William. In his closing narrative, a much older Adso reflects that he never regretted his decision, and that the girl was the only earthly love of his life, yet he never learned her name.
question: Who was the last one to speak with Adelmo?
answer: Venantius