Someone is poisoned, and Campion is convinced that the killer is part of the household.

Campion attends the funeral of an old schoolmate. Months later he finds himself investigating the murder of someone who might be the same man.

Campion investigates the murder of his school nemesis R.I. ‘Pig’ Peters.

Campion is invited to an art show by widow Belle Lafcadio , where a commercial artist is murdered. Suspicion falls on Belle’s granddaughter, but Campion believes she’s innocent.

Following another murder, Campion suspects the deaths may have been designed as a cover up for fraud and swapped paintings.

Averna, a tiny Dalmatian state, has attracted interest from the bold, bad baron of commerce Brett Savanake. But its rightful heirs are the Fitton family.

Albert returns to Pontisbright in disguise to trick Savanake into showing his hand.

Campion takes the lead when a series of pranks upset theatre star Jimmy Sutane.

Campion is ready to reveal the murderer.

A murder shakes up a respectable London publishing house.

In the name of justice, Campion has to prove the innocence of a man on trial for murder, enlisting the help of his manservant Lugg.