Miss Daisy Tannenbaum, almost thirteen, and homeschooling in Paris with her Aunt Millicent, takes a break from the City of Light and her dreaded math homework, and heads to a rambling chateau in the Loire Valley to help her Aunt Mill’s friend, former-spy Felix, catalog his art collection. But when Daisy receives a copy of the Mona Lisa as a thank you, strange things start to happen. This Mona is not just any copy, it’s one of two perfect forgeries created to fool the Nazis during their hunt for the real Mona Lisa during WWII. Daisy’s best friend from the states, Lucia, a newly minted teen model, and in Paris to audition for the spring runway shows, thinks Daisy’s Mona is the real one. Real or not, it’s worth a fortune, and when Felix suddenly dies, his family accuses Daisy of stealing it. Our plucky heroine must navigate a world of crazy, scheming, often criminal adults, not to mention traveling ghosts, ginormous pigs, testy lawyers, former spies, and obnoxious fashionistas, as she finds herself in a harrowing chase in and around Paris while trying to outwit them all to keep her beloved Mona.