Well, what's this madcap piece of speculative fiction about?

Second Officer John Peterson is finished as far as the Galactic clippers are concerned. Branded a deserter, stranded on Carinthia and desperate for a job, there are few places left to go. Private detective Steve Vynalek needs Petersen. Has a fanatical scientist on the planet Wenceslaus really found a way to beat the time travel problem, a way to bring back yesterday?

Probably, or else there's no story.

Cool ships, but I think the first one had difficulties with side visibility.