Nick investigates when the star of the play he's invested in is murdered. Nora insists on working with Nick because the dead man was found in her niece's apartment.
When a model doesn't show up for a charity fashion show, Nora agrees to take her place, not realizing the gown identifies the wearer as the woman to be murdered.
Nick and Nora decide their apartment is too small so they search for another with more space. Of course, the model they like comes with a corpse in the closet.
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.
Nora buys a used book which turns out to be a rare first-edition. The book was sold by mistake and the thieves who stole the book in the first place are intent on recovering the volume.
A condemned murdered vows to return from the grave to avenge himself upon the jury that convicted him. When three of the jurors are found slain, Nick and Nora decide to investigate.
Nora witnesses a murder. The killer, an actor who is a master of disguise, visits Nora in a number of different impersonations to see if she can recognize him.
Nick investigates when an expensive pin that Nora did not purchase is charged to her account. Along the way, he uncovers two murders and learns that Nora is slated to be a third victim
