Paris isn't for lovers. It's for fighters. Matilda Whipplethorn thought her mission would be simple. She'd get the cure for Miss Penrose and get out, but nothing is simple in Paris. The fairy revolution is heating up, not cooling down as the Whipplethorns were told. Navigating the city comes with unexpected dangers, blood-thirsty rebels, tyrannical royalists, and monsters of all kinds. The Vermillion clan holds the cure and they're in hiding. Every time Matilda asks a Parisian fairy about the Vermillion, she becomes their enemy in a city that is now all enemies and no allies. Now time is running out, and Miss Penrose is fading fast. If Matilda doesn't find the Vermillion, all the trouble will be for nothing.