Eden City, 1785. Sam's mother's Magical Medicine Show is going down a storm, especially with Prometheus helping them out. Suddenly they are rumbled.

Luckily for them, Zeus is in Eden City looking for the Avenger, and saves them. In return Sam has to help Zeus defeat seven terrifying monsters who have descended on the city. Will Sam overcome the monsters, and can Prometheus survive all this to find a human hero? In the "Fire Thief trilogy", Terry Deary reinvents the myth of Prometheus, the Titan who stole fire from the gods and gave it to the human race.

To escape the gods' revenge, Prometheus travels through time to the murky metropolis of Eden City. There he befriends a motley assortment of comic characters and learns what use humans have made of his gift.