The woman’s body was found in the early morning, on a bench in a New York City playground. She was clean, her hair neatly arranged, her makeup carefully applied. But other things were very wrong—like the tattoo and piercings, clearly new. The clothes, decades out of date. The fatal wound hidden beneath a ribbon around her neck. And the note: Bad Mommy, written in crayon as if by a child. Eve Dallas turns to the department’s top profiler, who...