I.Williams - Book 3, #1

Multiple personality disorder has never been so terrifying... Three months after the biggest blunder of her career, Detective Iris Williams is still severely depressed over the escape of the youngest serial killer she's ever encountered, 17-year-old Stacey McHill. The acting captain of the Double 0 placed Iris and Toni on desk duty, calling Iris an embarrassment to the department. Meanwhile, babies are being snatched from their strollers in broad daylight, and they're being replaced by life-like dolls.
Back on the streets, Iris can't shake the feeling of paranoia. Stacey is out there somewhere, waiting. And for Iris, anyone could be Stacey McHill...anyone. After Iris's great-niece is abducted by Stacey, the case becomes personal. Iris has to keep her emotions under control if she wants to stay on the case and save her great-niece.