The Roses of May by Dot Hutchinson

Near an isolated mansion lies a beautiful garden.

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.