"Thrilling, gripping, action-packed." - The Guardian In the fourth book of this high-octane series, the Inventory's final secrets are revealed! Having learned a troubling truth about himself in the Black Zone of the Inventory, Dev is called back into action to defend the world's greatest store of futuristic tech, and he'll need all the help he can get from his friends. Someone has stolen Winter Storm, a swarm of powerful biobots, and is using them to infect and control people! Who can be trusted now? THE INVENTORY SERIES OF BOOKS Iron Fist (book 1) Gravity (book 2) Black Knight (book 3) Winter Storm (book 4)