The Lump That Ate Long Island

When humans finally left the Earth they found that even the vast gulfs of space could not stop them making war on each other. 

Crewman Marcia March is new to The Fleet, but already she is having trouble. The lump in her mattress is making it hard for her to sleep. It is going to be a long voyage for her, and an even longer on for the crew of the Petra as they learn they should havel listened.