Spike Tracy, playboy and amateur detective, is bored at his country retreat, until a woman comes out of the storm, exhausted and nearly dead. His housekeeper helps him nurse her but he's relieved when the storm finally clears, several days later, and he can get a doctor...but before he does anything, he learns that she's wanted by the police for murder. Still keeping the woman under cover, he infiltrates himself into the investigation--it helps that his brother is the district attorney--and finds himself in a world of obsessive stamp collectors and valuable stamps.