In this garden grow luscious flowers, shady trees…and a collection of precious “butterflies”―young women who have been kidnapped and intricately tattooed to resemble their namesakes. Overseeing it all is the Gardener, a brutal, twisted man obsessed with capturing and preserving his lovely specimens.

When the garden is discovered, a survivor is brought in for questioning. FBI agents Victor Hanoverian and Brandon Eddison are tasked with piecing together one of the most stomach-churning cases of their careers. But the girl, known only as Maya, proves to be a puzzle herself.