For detective Jessica Daniel, early-morning phone calls are never a good sign. Especially after her partner Harry Thomas’s controversial retirement left her with a promotion and more responsibility than she’d asked for. When the phone rings this time, it’s detective Jack Cole, calling to clue Jessica in on a body two-days dead. The crime scene unit turns up no evidence, but Jessica knows the key to solving this murder lies in what she can’t see — if the windows and doors are locked from the inside, how did the killer get in and out? Suddenly, reporter Garry Ashford writes a front-page story on the case, revealing details he shouldn’t know. When questioned, Garry says he has to protect his source’s anonymity — then a day later, another body surfaces. Does Garry know more than he’s telling? Jessica Daniel is prepared to unlock the terrifying clues.