While on vacation, the Saint discovers a much-sought-after music box.

Smith is an iron-willed railroad detective. When his friend Murray is fired from the railroad and begins helping Rebstock wreck trains, Smith must go after him. He also seems to have an interest in Murray's wife (and vice versa).

Oliver Pease gets a dose of courage from his wife Martha and tricks the editor of the paper (where he writes lost pet notices) into assigning him the day's roving question. Martha suggests, "Has a little child ever changed your life?" Oliver gets answers from two slow-talking musicians, an actress whose roles usually feature a sarong, and an itinerant cardsharp. In each case the "little child" is hardly innocent: in the first, a local auto mechanic's "baby" turns out to be fully developed as a woman and a musician; in the second, a spoiled child star learns kindness; in the third, the family of a lost brat doesn't want him returned. And Oliver, what becomes of him?