Meaney and Llewellyn are trainees in the Lead Service - a sort-of self-appointed "Reality Police" who travel to parallel Universe and ensure everything is occurring as it should. They've hit a bit of a problem, however - a disastrous set of circumstances during their first field training exercise have left them stranded in a broken JumpShip, aimlessly jumping from one random Universe to the next. While Meaney is trying hard to return to the career he loves, Llewellyn is content to meander aimlessly through existence.
Getting back to Lead H.Q. continues to look like an impossible task...