Trouble is haunting Cassidy Blake . . . even more than usual. She (plus her ghost best friend, Jacob, of course) are in Paris, where Cass's parents are filming their TV show about the world's most haunted cities. Sure, it's fun eating croissants and seeing the Eiffel Tower, but there's true ghostly danger lurking beneath Paris, in the creepy underground Catacombs. When Cass accidentally awakens a frighteningly strong spirit, she must rely on her still-growing skills as a ghosthunter -- and turn to friends both old and new to help her unravel a mystery. But time is running out, and the spirit is only growing stronger. And if Cass fails, the force she's unleashed could haunt the city forever.

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V. E. Schwab
Victoria Elizabeth Schwab is an American fantasy author best known for her 2013 novel Vicious, which The Guardian called Vicious "a brilliant exploration of the superhero mythos and a riveting revenge thriller", the Shades of Magic series, and for her children's and young adult fiction published under the name Victoria Schwab. Her work has received critical acclaim, been featured by EW and The New York Times, been translated into more than a dozen languages, and been optioned for TV and Film. The Independent calls her the “natural successor to Diana Wynne Jones” and touts her “enviable, almost Gaimanesque ability to switch between styles, genres, and tones.”