The thrilling sequel to Victoria Schwab´s New York Times bestselling City of Ghosts! 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. 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...)