Perilous Obsession: Brad Parker and Karen Richmond Medical Thrillers (Unabridged‪)‬

A tragic overdose, an institutional cover-up, and human trafficking. When Dr. Brad Parker helps investigate the death of a patient at a Portland, Maine cancer center, he senses a cover-up to protect the responsible physician. 

His suspicions are quickly confirmed when both doctors involved in the case are found dead. As Brad and his partner—FBI agent Karen Richmond—investigate, they uncover a hospital-based sex trafficking operation, leaving them struggling to identify the man at the top before the victim count rises.