Horowitz has expressed no desire to accompany Hawthorne anywhere, so when he agrees to write one more book about the detective, his publisher asks him to spend quality time with his subject and gather material at the same time.
Horowitz naps through the festival’s opening talk, but he does attend the reception offered by the festival’s patron, Charles le Mesurier. A gracious host, but due to his aspirations for the island’s potential pipeline, Charles has made many enemies. Horowitz realises that Hawthorne also has a sworn enemy of his own on the island. Once, while Derek Abbott was being questioned for wrongdoing at the police station, it appeared that Hawthorne accidentally pushed him down the stairs. Now that Abbott is out of jail, Hawthorne's visit to the island is timed so that he can track Abbott down.
Now that there has been a murder, the island becomes a version of Agatha Christie’s Ten Little Indians. The murderer is among them so none of the festival participants are allowed to leave. And each author is ready to accuse the next.
Meanwhile, Hawthorne would be conducting his own investigation on the sly. And our narrator tags along, riding on his coattails.
And during the investigation, Hawthorne is always a step ahead of Horowitz, as they close in on the murderer. The antics of the odd couple add up to a romp around an island where even the taxi driver seems a likely suspect.
For the reader, unfolding the mystery is like unwrapping a present that has been concealed in multiple layers. We’re on a pleasant ride throughout Alderney until we slide into the final solution at the end.