Cry Baby is the fourth novel in the Detective Callum Doyle series by author David Jackson. Erin Vogel is attacked and left unconscious in her apartment. When she wakes up she finds that her six month old baby has been kidnapped. But she is given a chance to get her back because the kidnapper has placed an ear bug and camera on her only the price is unthinkable- she must kill people.
This has quite the twist on the idea of a serial killer thriller as Erin must kill random people on behalf of the killer who her instructs her to leave a message on each of the bodies. Read the full review here