Thomas Blades, a 17th century curate, discovers a magical door to another world - or rather to an alternative Earth. But here, humanity is not the top of the food chain, as Blades finds when the poor, burrow-dwelling humans he stumbles over are hunted and eaten by the Null - mighty, ravening beasts whose intelligence and killing ability makes them top predator. Returning to our own world for weapons, Blades vows to become humanity's saviour on his...