Someone stole the Mona Lisa. Okay, it was over a hundred years ago, but a recently uncovered letter reveals that the thief forged a copy. That means that the painting in the Louvre now is a fake. And the real Mona Lisa could be anywhere!

Friday Barnes needs to find the truth - and the real painting. She's going undercover as an art student, along with her partner-in-crime-solving, Melanie, and her staggeringly good-looking boyfrenemy, Ian.

As they watch the comings and goings of France's most famous art gallery, they see some very strange things. Amid digital pickpockets, guerrilla graffiti and projectile perfume, Friday soon discovers that the Paris art scene is a hotbed of crime.