Severance

In Severance, the debut novel from famed Cracked.com writer Chris Bucholz, the inhabitants of a generation ark find two unlikely heroes who fight to keep everything together.
After 240 years traveling toward Tau Prius and a new planet to colonize, the inhabitants of the generation ship Argos are bored and aimless. They join groups such as the Markers and the Breeders, have costumed orgies, and test the limits of drugs, alcohol, and pain just to pass the time.
To Laura Stein, they're morons and, other than a small handful of friends, she'd rather spend time with her meat plant than with any of her fellow passengers. But when one of her subordinates is murdered while out on a job, Laura takes it as her responsibility to find out what happened. She expects to find a personal grudge or a drug deal gone wrong, but instead stumbles upon a conspiracy that could tear the ship in two.
Labelled a terrorist and used as a pawn in the ultimate struggle for control, Laura, with help from her friend Bruce and clues left by a geneticist from the past, digs deep into the inner working of the ship, shimmying her way through ductwork, rallying the begrudged passengers to rise up and fight, and peeking into an unsavory past to learn the truth and save their future.