Trouble is haunting Cassidy Blake . . . even more than usual.She (plus her ghost best friend, Jacob, of course) is 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.#1 New York Times bestselling author Victoria Schwab returns to the spooky and heart-pounding world of City of Ghosts, delivering thrilling new adventures and an unforgettable spin on friendship. (Because sometimes, even psychic ghost best friends have secrets . . .)