Dark Heresy: Sins of the Father
Gaius Solomon was born in the void. He grew up in a research station in the Calixis sector. Almost everyone aboard the station was a member of the Administratum or the Mechanicus. His father once joked that Gaius wasn't born, he was requisitioned from the Imperium. Following in the footsteps of his father, Gaius joined the Adeptas Administratum when he was a youth.
Gaius advanced far in the Administratum. He eventually reached the rank of Master Chirurgeon. Since the station had no openings for a chirurgeon, Gaius volunteered for work on a Rogue Trader that was refueling at the station. Bravely stepping out into the world, Gaius was unprepared for what he would run into in the uncharted areas of the void.
As Master Chirurgeon of the Rogue Trader, Gaius was responsible for the well being of the crew he served. He had grown close to some crew members over the years. The captain of the Trader decided to stop on a Dead world. He had heard rumors of a criminal colony that was a good source for "hard to find" goods. He asked Gaius to accompany him for translation purposes. While there, Gaius saw an ancient book with weird symbols on the cover. He purchased it from the seller for a trivial price and brought it back to the ship for further reading.
It was several years after leaving the station he was born on that Giaus first encountered forbidden lore. Back home he knew of brash adepts who would seek out forbidden knowledge in hopes of progressing in ranks faster. Usually they found an Inquisitor's logbook or a prayer book of an unsanctioned cult. The book Gaius found was much more nefarious.
The book Gaius had found was very hard to translate. When he finally broke the cipher, Giaus realized he has found forbidden knowledge. Not only was this book forbidden, it was heresy! He locked it in his footlocker and promised to destroy it the first chance he had. Unfortunately, Gaius was not he only person to bring something dastardly off the Dead world.
Syrah was the captain's daughter and the ships' cook. She found some interesting fruit on the planet and decided to bring it back and cook a feast for the captain and crew. After eating the overly delicious meal, the crew became very lethargic and retired to their quarters. The first screams were heard an hour later.
Shortly after, Gaius' sickbay was filled with sick crew. A fever was ravaging those who ate the fruit. The skin of the victims began to pale and become a putrid greenish color, and they vomited almost constantly. Gaius had nothing to stop the fever. He consulted all of his texts on the subject. He even looked through his book on Xenos diseases. This fever resembled nothing of the sort. While desperately searching for a cure, he remembered the book he found.
Carefully following the guidelines in the book, Gaius prepared a ritual he believed to control and stop diseases. The ritual worked and the fevers broke and everyone seemed to return to normal. The Trader returned to the Calixis Sector. The captain thanks Gaius for his service and his valiant efforts in saving his crew, then unceremoniously left him at the station dock.
As Gaius was picking up his belongings, a man approached him claiming to be an acolyte of an Inquisitor. The Inquisitor had heard of Gaius' miraculous cure and wished to hire him into his services.