Answers to questions and the very survival of humanity depend on understanding the connection between the Map on the Skin and the Well of Souls. The search for the Map began in a London alley, but has since expanded incredibly in space and time, and many seekers have joined the search. Keith, Mina , Gianni, Cass, Haven and Giles gathered at Mina's coffee shop in 16th century Prague to find the way to the Well of Souls. However, their shadow lamps have died, and they still do not have any part of the Map, except for photographs of the images in the cave. They face a difficult journey, and Haven and Giles suddenly disappear, and with them Sir Henry's diary. At the same time, the Zetetic Society receives information about an imminent catastrophe on a universal scale. Now the fate of the entire universe depends on solving the mystery of the Map on the Skin.