Seventeen-year-old Aussie Che Taylor loves his younger sister Rosa. But he's also certain that she's a diagnosable psychopath—clinically, threateningly, dangerously. Recently Rosa has been making trouble, hurting things. Che is the only one who knows; he's the only one his sister trusts. Rosa is smart, talented, pretty, and very good at hiding what she is and the violence she's capable of.

Their parents, whose business takes the family from place to place, brush off the warning signs as Rosa's "acting out." Now that they have moved again—from Bangkok to New York City—their new hometown provides far too many opportunities for Rosa to play her increasingly complex and disturbing games. Alone, Che must balance his desire to protect Rosa from the world with the desperate need to protect the world from her.

Sydney's deadly Razorhurst neighborhood, 1932. Gloriana Nelson and Mr. Davidson, two ruthless mob bosses, have reached a fragile peace—one maintained by "razor men." Kelpie, orphaned and living on the street, is blessed and cursed with the ability to see Razorhurst's many ghosts, and she sees the cracks already forming in their truce. Then Kelpie meets Dymphna Campbell.

Dymphna is a legendary beauty and prized moll of Gloriana Nelson. She's earned the nickname "Angel of Death" for the trail of beaus who have died trying to protect her from Mr. Davidson's assassins. Unbeknownst to Kelpie, Dymphna can see ghosts, too, and as Gloriana's hold crumbles one burly henchman at a time, the girls will need one another more than ever.

As loyalties shift and betrayal threatens at every turn, Dymphna is determined to not only survive but rise to the top with Kelpie at her side.