Harley Quinn is missing! She has been kidnapped by a mysterious criminal. But by whom? The streets of Gotham are haunted by monsters that look like the bizarre Joker and collect severed heads. But why? Jim Gordon has disappeared, and Batman, having received a package with a bloody piece of the commissioner, realises that he must do anything to save him. But how? When the Joker offers Batman a shaky alliance, the answers to all these questions become apparent, and soon a sinis...
