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Returning to Paris from an Alpine ski holiday, Reggie Lambert finds her husband, Charles, murdered.  A vacation acquaintance, Peter Joshua, offers his services and assists her in finding a hotel room.  Lambert's funeral is attended by three strange Americans.

Summoned to the U. S. Embassy, Reggie is informed by supposed C.I.A. official Hamilton Bartholomew that Lambert and four accomplices had pilfered $250,000 in gold destined for the French Resistance during World War II, and that the government would appreciate her assistance in finding the loot.  He further confides his fear for her life.  Reggie assures Bartholomew, however, that she has no idea where the money is.  The agent further informs the widow that, among Lambert's former associates, only Carson Dyle is deceased; the others attended her husband's funeral.

Threatened by the trio, Reggie confides in Joshua, who reveals that he is Dyle's vengeful brother Alexander.  Informed by Bartholomew that Dyle had no brother, Reggie confronts Joshua, who now asserts that he is thief Adam Canfield.  When the American trio is murdered, Reggie assumes that her friend is, in fact, Alexander Dyle.

En route to deliver the three rare stamps representing the purloined $250,000 Reggie meets Joshua, who discloses that Bartholomew is in reality Carson Dyle.  Unmasked, the murderer flees to the Comédie Française, where he falls to his death through an open trap door.  Joshua thereupon reveals to Reggie that he is U.S. Treasury agent Brian Cruikshank, accepts the stamps, and embraces the widow.