The instant New York Times bestseller!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 re