Beloved Vera Bethune stars as Miss Aggie in a radio soap opera, but is about to be written out. One day she drinks water from a jug and is poisoned in a murder attempt. She is taken to the hospital and survives, but the killer returns.

Ellery and his agent, Howard Biggers, travel to the estate of the wealthy and eccentric Spencer Lockridge. It seems as though Biggers wants to turn one of Ellery's books into a play and is trying to get Lockridge to provide the financial backing. All goes for naught when Lockridge disappears while wearing a Mad Hatter's costume from the Alice in Wonderland theme party he was throwing. Whodunit? Could it have been someone from New York or maybe even Dallas?

Burlesque producer Sam Packer is found dead of an apparent heart attack but he leaves behind a video to be shown at his funeral in which he states that no matter what it looks like, he will be murdered. Packer, in the video, asks radio mystery star Simon Brimmer to solve his murder. Packer's widow, knowing that Simon can't figure out his butt from third base, goes to Ellery and asks for his help. Brimmer once again tries to best Ellery and once again is 100% wrong.

Simon Brimmer arrives at a restaurant where he is to give a live-remote broadcast of his highly rated mystery radio program. Ellery and the Inspector are invited to attend. As you would figure, a murder is committed on the premises. One of the owners is poisoned by a bottle of wine. Can Simon beat Ellery to the solution of the case? Of course not.

Simon Brimmer once again fingers the wrong culprit in this tale about the murder of a socialite who was apparently leading a double life. The case has its underpinnings in events that happened in 1922 France. It's a hard road to the solution and Ellery takes the correct one as usual.