Who can unlock the mystery of a map that spans history and alternate realities? Kit Livingstone stumbled upon a powerful ley line inside the Bone House that transported him to an almost magical place: the Well of Souls. While there, he witnessed Arthur Flinders-Petrie, the Man Who Is Map, carry his dead wife into a pool of light and emerge with her alive again. Could the location of this place be the secret so jealously guarded by the Skin Map? Archaeologist Cassandra Clarke is suddenly transported from a deserted canyon in Arizona to a busy street in Damacus, circa 1950. Through circumstances too precise to be coincidental she arrives at the door of the Zetetic Society-the Seekers-and is asked to join their quest to track down Cosimo Livingstone and his grandson Kit. But joining their cause is the last thing Cass plans to do. Meanwhile, Douglas Flinders-Petrie-great-grandson of Arthur-ruthlessly pursues the map. Livid that his father withheld it from him, he is determined to find and keep whatever treasure the map holds for himself. From the Stone Age to the Well of Souls, from medieval Oxford to modern-day Spain, from the pyramids of Egypt to an ancient shrine in China, the race continues for a prize beyond all imagining.