A frantic phone call from the wife of her former partner plunges LAPD police detective Sarah Milton and her teenage poltergeist sidekick, Anna Nigma, into a deadly mystery involving one of their most dangerous foes, convicted serial killer Harry Sands; otherwise known as "The Fancy Dress Killer." The Violent Crimes Unit is in the hotseat to find the copycat killer responsible for a recent string of murders plaguing the city, leaving Sarah scrambling to understand the bizarre, otherworldly aspects to this latest murder spree. Enemies from her past conspire with a new, even deadlier foe, in a thrilling adventure that threatens not only her life, but also the fate of those she holds dear, culminating in a supernatural showdown against an evil entity that ultimately tests the limits of her faith and courage.