Trouble is haunting Cassidy Blake . . . even more than usual.She (plus her ghost best friend, Jacob, of course) is in Paris, where Casss parents are filming their TV show about the worlds most haunted cities. Sure, its fun eating croissants and seeing the Eiffel Tower, but theres 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 frie