While playing with his new telescope, Nick spots a man behaving oddly on a nearby bridge. When he later meets the same man at a party for a visiting Middle Eastern diplomat, Nick suspects that the foreign dignitary is in danger.
Bored with life, Nick threatens a return his career as a private detective. In order to discourage him from taking such a step, a friend bets Nick that he can't discover how he has stolen a priceless Inca artifact.
While on a Caribbean cruise, Nick and Nora investigate a burglary where the stolen goods are discovered in a fellow passenger's stateroom. The accused man is a New York City policeman who swears he was framed.