After an armored car heist, Monk and Natalie arrive on the scene to join Capt. Stottlemeyer and Lt. Disher in the investigation. While Monk picks up clues, Lt. Disher complains of a horrible toothache. Capt. Stottlemeyer insists that Lt. Disher visit a dentist immediately. Disher goes to the office of Dr. Oliver Bloom, and soon finds himself under sedation while Dr. Bloom extracts a tooth. Then, something strange happens: while floating in and out of consciousness, Lt. Disher sees - or thinks he sees - Dr. Bloom and his assistant kill an intrude. But the captain doesn't believe him. Nobody does.