Ghost thief

"Benjamin Crisp's life is turned upside down when he receives a mysterious atlas from his great-uncle Albert. It turns out Albert belongs to a secret alchemist society that for centuries has preserved the world's greatest minds as ghosts. Now he needs help. Sent to hunt down a missing ghost, Crisp soon discovers a horrifying plot: someone has unearthed a long-buried language of angles and banished them from Earth, destroying the delicate balance between good and evil. Crisp must unravel the riddle of the atlas while avoiding a dangerous enemy determined to stop him. If he fails, the world will be thrown into an age darker than it has ever known"--Page 4 of cover.