While under sedation in the dentist's chair, Disher is certain that he saw the dentist and his assistant murder a man. However, he has trouble getting people to believe him, as they all think that he probably imagined it. He then pays a visit to Monk and asks him to look into it for him. Despite his huge fear of dentists, Monk agrees to investigate Disher's claims and after some digging, he realizes that the dentist might actually be tied to a crime that took place earlier.