Deep in the murkiest back streets of old London town, three children are escaping from an orphanage. But lurking in the fog, watching Rose, Lily and Ned, is a king among villains - Mack the Knife!

A dreadful fate looks certain until, from out of nowhere, a figure with glowing, red eyes appears. He leaps through the air like a firework - it's Spring-Heeled Jack, scourge of evil-doers!