An edge-of-your seat adventure set in the iconic world of Mortal Engines!Can they get out of the Frying Pan without getting into the fire?Tamzin Pook and her group of unlikely fighters-turned-friends have managed to make it out of Thorbury alive. Now with a massive, terrifying, armored, and un-dead Revenant (and its pet kitten) as one of their gang.For their next mission, Tamzin and her friends head to the city of Museion to help save it from the ferocious predator suburbs that surround it and keep it trapped in the mountain valley known as the Frying Pan.Here, Tamzin, Max Angmering, Oddington Doom, and Hilly Torpenhow are in for the toughest fight of their lives. But as they battle for the fate of Museion against the terrible predators that surround them, people on board Museion start to die one by one from a traitor within.They've got to figure out an escape, but every direction looks like a trap.