Johnny Riggs, a con man on the lam, finds himself in a Latin-American country named Patria. There, he overhears a convent-bred rich girl praying to her guardian angel for help in managing her tangled business affairs. Riggs decides to materialize as the girl's "angel", gains her unquestioning confidence, and helps himself to the deluded girl's millions. Just as he and his partner are about to flee Patria with their booty, Riggs realizes he has fallen in love with the girl and returns the money, together with a note that is part confession and part love letter. But the larcenous duo's escape from Patria turns out to be more difficult than they could ever have imagined.

Behind the locked doors of a mental institution resides crooked politico Judge Drake, free from prosecution so long as he pretends to be crazy. To get the goods on Drake, private detective Ross Stewart has himself committed to the asylum as a patient. Meanwhile, reporter Kathy Lawrence, posing as Stewart's wife, acts as his liaison to the outside world.

Horace Vendig always gets what he wants. Even as a poor youth, he charmed his way into high society by getting the father of his friend, Martha, to foot the bill for his Harvard education. When Vic, another childhood pal, is invited to Horace's mansion for a party, he brings along Mallory Flagg, who happens to bear a striking resemblance to Martha. As Vic and Horace reunite, old resentments rise to the surface.