Thelma Henderson is missing, and Rick discovers that her husband Walter has heavily insured her life.

A heavily insured item is stolen from Harry Medford. The item: a cheap rag doll. Robin goes to Mexico City in hopes of recovering a stolen miniature cradle containing valuable cargo which is concealed in a rag doll.

Robin Scott's apartment is burglarized and bugged by a clever gang of swindlers, headed by Fred Caine, an unscrupulous private eye, and Jack Hayes, who looks and talks like Robin.