Sam, who is in his early twenties, is an orphan, taken in when he was younger by his well-off Aunt Merry who has an eccentric taste for antiques and travel. Together, Sam and Merry have solved some of the most notorious murders in the world. And true to form, their Parisian vacation is cut short when they stumble upon a murder scene so bizarre that only a raging psychopath could have produced it. But to solve the crime, they have to wrestle with jewel thieves, art forgers, gun-runners, a lost puppy, and a master French detective who may just solve the crime before they do.