Golden Fleece — Robert J. Sawyer

Aboard Argo, a colonization ship bound for Eta Cephei IV, people are very close - there''s no other choice. So when Aaron Rossman''s ex-wife dies in what seems to be a bizarre accident, everyone offers their sympathy, politely keeping their suspicions of suicide to themselves. But Aaron cannot simply accept her death. He must know the truth: Was it an accident, or did she commit suicide? When Aaron discovers the truth behind her death, he is faced with a terrible secret - a secret that could cost him his life.