Micheline Helsing is a tetrachromat—a girl who sees auras of the undead in a prismatic spectrum. As one of the last descendants of the Van Helsing lineage, she's trained to destroy monsters both corporeal and spiritual. With an analog SLR camera as her best weapon, Micheline exorcises ghosts by capturing their energy on film. She's aided by Oliver, a techno-whiz; Jude, who can predict death; and Ryder, the boy she's loved forever.

When a ghost hunt goes awry, Micheline and the boys are infected with a curse called a soulchain. Micheline learns that if she doesn't exorcise in seven days, she and her friends will die. Now pursued as a renegade agent by her monster-hunting father, Leonard Helsing, she must track and destroy an entity more powerful than anything she's faced before . . . or die trying.