Natalie tries to arrange a surprise birthday party for Monk while he probes the mysterious death of an office building's maintenance man.
After Monk's insurance company refuses to pay for more private therapy sessions, he joins Dr. Bell's therapy group, where it appears that someone is murdering fellow patients. Tim Bagley and Hector Elizondo guest star.
After Sharona returns to San Francisco to handle legal issues related to an uncle's death, Monk suspects foul play and finds himself torn between the different styles of Sharona and Natalie. Bitty Schram guest stars.