All Hallows Eve approaches and for once Raven Storm has plans to spend the holiday enjoying a party at Isle of Night with family and friends, something she hasn't done since high school.
But someone has other plans and Raven is called to investigate the grisly murder of Monsignor Quinn, a priest left to drown in his own blood. He is the fifth such victim in as many weeks and local police are baffled.
With a new, untested partner Raven must delve into Boston's underworld and confront an ancient evil, a creature like nothing she's ever seen, before it kills again.
But how do you stop someone who wears your own face?