He is one weird Christmas visitor - his hair and moustache an unearthly white blond, his voice a gruff rumble.

When Eric meets the crazy rat catcher, a boring Christmas somehow changes - fast.

At first, he just agrees to help out by spotting the rat, but soon it seems Eric has somehow become part of the rat catcher's vengeful mission.

As Eric attempts to return to his ordinary Christmas holiday activities, the exterminator cranks up the pressure.

Can this really be happening? One moment he's the hunter, the next it is he who feels he is being hunted in a terrifying Christmas Eve nightmare.

But surely no one would want to kill at Christmas time...Would they?