Cave Dwellers: A novel

In late 1937, a young German lieutenant, Oskar Langweil, is recruited to help overthrow Adolf Hitler. An exiled childhood friend introduces him to Lena, another expat and an avowed Socialist, and they contrive to pose as husband and wife to cross the Atlantic aboard a cruise ship crowded with Nazis. But once at sea they become entangled with the feckless son of a U.S. senator, as well as the mysterious SS officer assigned to watch over him, and after docking in Bremerhaven their luck lurche...