Knock Knock: An Absolutely Pulse-Racing, Heart-Stopping Crime Thriller

When Natasha Mayston is found dead under mysterious circumstances, Detective Dan Lockhart uncovers disturbing similarities to a previous case, suggesting the work of a cunning serial killer. As he teams up with psychologist Dr. Lexi Green to track down the perpetrator, they face mounting dangers and unexpected twists. Fans of fast-paced, suspenseful crime novels will be drawn into this gripping series from Chris Merritt.