Paul Kilgerrin on the train again -- this time with a German scientist, now wanted by the Russians, and his research on the atomic bomb, his target. A lead to a night-club in Marseilles, the disappearance of two other Americans, the murder of one, counterfeiting, black marketeering, and Kilgerrin gets his evidence, but is unable to bring it back alive....One of the more durable exponents of counterespionage, Kilgerrin provides familiar, by now formula, action-adventure.