Trail of the Zodiac — Jon Mills

Two killers -- one hunts for justice, the other for fun. Their worlds are about to collide. In the late 1960s, the Zodiac Killer went on a rampage in California. To this day the case remains unsolved and the killer's identity is still unknown. Forty-eight years later, after a series of new murders and taunting ciphers uploaded to the internet gain attention, the San Francisco Police believe he's back. When an old flame contacts Jack Winchester to inform him that her son is dead, the case becomes personal. As the bodies pile up, and Jack gets close, the psychopath turns the tables to play a deadly game of cat and mouse, where there's no telling who will survive. Jack Winchester returns in another unrelenting, fast-moving, action-packed book.