On a frosty Christmas morning, a mother finds her daughter at the porch - with her throat cut, in a puddle of icy blood. Who needed to kill Marissa, a beautiful and frivolous burlesque show dancer? Having not yet recovered from the previous difficult investigation, detective Erica Foster plunges headlong into a new case. The CCTV footage shows that Marissa was attacked by a dark figure with his face covered with a gas mask. Soon it becomes known that the inhabitants of the suburbs of London are attacked by a tall man in the same clothes. Now Erica has a lead.