A journey into the heart of danger…

In his greatest adventure, shape-shifting, masked spy Modo has a much more personal quest: to find his parents before the Clockwork Guild does. There is something in their blood--his blood!--that his enemies want to use to create an unstoppable army. When the Clockwork Guild find Modo's parents first, Octavia and Modo chase them across Europe and North America to the Island of Doom. Joined by memorable characters from the first three books--some lovable, and some terrifying and evil—the two spies dash towards a thrilling conclusion.