When, in 1931, there is a breach between this world and the Archipelago of Dreams, John and Jack, two of the Caretakers of the Imaginarium Geographica, must race through history using a time travel device left by Jules Verne, and discover the identity of the Cartographer.

World War II has been raging for three years, but a more terrible evil is just over the horizon. The last stones are falling from the Keep of Time, and the Imperial Cartological Society, led by Richard Burton, has collected doors and is building a new tower at the request of an old enemy: the Winter King's shadow. He has a terrible weapon -- the Spear of Destiny -- that can be used to command the shadows of anyone it touches. The Shadow King uses...