Shawn and Gus have run into a problem on their latest case. They are investigating the disappearance of Oswald Chester in a place that is impossible to sneak into, Glorious Pines, the most exclusive retirement community in Santa Barbara. They convince Henry to go undercover as Talmadge McGulager, who has actually gotten in off the wait list. However, Shawn has already informed the real Talmadge that he cannot move in for three more days giving them time to investigate. Once inside, they hook up with their client, Jervis Kent. Jervis is a security guard with minimal clearance but he did manage to get Talmadge the empty bed in Oswald's room. Oswald disappeared three days ago but the Glorious Pines staff and the police refuse to investigate since Oswald has a history of disappearing then reappearing a few days later. But Jervis, being Oswald's best friend, knows that this time is different. Shawn spots Oswald's wallet next to a rope bracelet on the nightstand. He concludes that Oswald wouldn't voluntarily take off without money and an ID. Gus sees that he's left his blood pressure medication behind as well. Shawn notices evidence that Oswald was training for a marathon and deduces he probably went missing on one of his practice runs.

Henry is sick, Shawn tells Gus. He called to cancel their weekend camping trip in the mountains and Shawn couldn't be more thrilled, until he catches his dad driving through town, the picture of health. Now Shawn has to know why he was ditched, and he and Gus follow Henry to the Monarch Lodge, where they discover Henry is a member. After Shawn perfectly repeats the secret handshake, they enter the lodge to find Henry in a room full of robed lodge members, surrounding a dead body on the floor. The brothers have called Henry in for help, but he insists he's retired both from the force and the lodge and calls the police. Gus, meanwhile, realizes he's in a room full of doctors, and gingerly steps around the body to start networking. Shawn tells Henry that the deceased, Arthur Holmstrom, was murdered, possibly by poison, and no one in the room seems to be upset about his death. Henry's friend Ted Archibald, who called them in, is worried they did something wrong during Arthur's Patriarch ceremony. He had a ceremonial hood on for twenty minutes, and is worried Arthur might have suffocated. Lassiter and Juliet arrive at the scene. It turns out Lassiter has always wanted to be a member but has been blackballed by his soon to be former father-in-law, Irving Parker. Now Lassiter is determined to solve the case quickly to impress Irving and the rest of the lodge members. Meanwhile, Gus has been busy locking down an appointment with Dr. Downs, who has a large practice and is a big purchaser of pharmaceuticals.