Silent Screams by C. E. Lawrence

This extensive text details Lee Campbell, a criminal profiler assisting the NYPD on a series of murders known as the Slasher case. Lee works alongside detectives Chuck Morton and Butts, and occasionally consults with his mentor, Professor Nelson. The victims are primarily young women, with evidence suggesting strangulation and post-mortem carvings related to the Lord's Prayer. The narrative also explores Lee's personal struggles, including the disappearance of his sister, a recent mental health breakdown, and his budding relationship with forensic pathologist Kathy Azarian. The investigation eventually reveals the killer is Samuel, a disturbed young man, but a shocking twist reveals that Professor Nelson was the mastermind behind the killings, manipulating Samuel as an instrument of his rage following his wife's death.