To investigate the disappearance of one of its residents, Shawn and Gus try to break into an old folks' home. They have absolutely no luck until they dupe Henry into posing as a potential resident himself.
Back at the station, Lassiter and Juliet have to try to rehabilitate a juvenile delinquent, who is related to the deputy mayor. The team pairs off, but Lassiter's tough talk cannot quell the kid's constant harassment of Juliet.
The boys do some outdoor searching when Shawn discovers that the disappeared man - Oswald - was training for a marathon. They find him wounded in the hospital, but cannot identify the cause of his injury.
At the home, Henry insists on remaining incognito, citing that something is still awry. The boys do some more searching and find that one of the nurses that works at the home was poisoning some of the residents to get her mother higher on the wait list for entry. She is taken into custody.
Juliet manages to sort out the delinquent. She brings him into the Chief's office and exchanges harsh, but unheard, words with him. He promptly leaves the room and apologizes to everyone. Juliet walks away, satisfied with her day's work.