Life on Knowhere is pretty good for Peter and the other Guardians of the Galaxy. That is until Captain Marvel arrives. She tells Peter that a shape-shifter is on Knowhere and holds the key to a powerful weapon capable of destroying entire planets, including Earth! With a race against time, the duo must find this mysterious villain before he detonates the device. But how do you catch someone that could be anyone - including your friends? Will Peter succeed in foiling the shape-shifter's plan and leave him Knowhere to run? Find out what happens in this Mighty Marvel Chapter Book.