Professor Waning Glory takes his new friend Tubby on a trip in a boat that stays always at 9 p.m. in a lofty time-river of some sort, starting at Coney Island, then Chicago, then Denver, and farther west. The professor is able to briefly stop the boat above Chicago, where time for those below stays frozen at 9 p.m., and when their boat crosses the 180° meridian, they travel back a day. Eventually, they arrive back at their starting point on Coney Island, where it is still 9 p.m.

Carl Lanser finds himself on a transatlantic voyage of the cargo liner S.S. Queen of Glasgow, in 1942, not knowing much about himself or how he got there, but knowing volumes about submarine warfare.