Mika and Ellie live in a future behind a wall: Solid concrete topped with high voltage razor wire and guarded by a battalion of Ghengis Borgs, it was built to keep out the animals, because animals carry the plague. At least that's what Ellie, who was kidnapped as child, has always been taught. But ever since Ellie vanished a year ago Mika has suspected that his world may be built on secrets.