Mason Black works as a private investigator after he handed in his detective badge. When two bodies of two children were found with messages written in blood by a serial killer who uses the same pattern in every case. Mason will take action since he has got skills that the San Francisco Police Department doesn't. With his marriage falling apart, he must choose whether to fix his personal life or go after the killer. The story reveals shocking secrets and mindblowing twists that will keep you on the edge of your seat.