After a police department baseball game, the whole gang goes to a bar to celebrate McNab's birthday. But, as the waiters bring out the cake, Shawn spots a hooded man by the register with a bulge in his jacket. He runs to warn Lassiter who pulls out his weapons just as the hooded man starts to fire. After a barrage of bullets, the man manages to escape. The cops think it was an attempted robbery but Shawn says the man came there specifically to kill one of them. He believes he will try again, but if they can figure out which one of them was the target, it will give them a clue to the man's identity. The crime scene unit finds a piece of the man's hooded sweatshirt and a motel key in the alley behind the bar. It looks like his pocket ripped as he was fleeing the scene. Lassiter and Juliet head to the motel while Shawn and Gus go back to the bar. While there, Shawn remembers the shooter was wearing an expensive watch, which proves he wasn't a junkie thief. Shawn also realizes that he was deliberately standing in the blind spot of the security cameras. The shooter is much smarter than they give him credit for, which means that the key was planted to lure the cops to the motel.

A man on a bike pedals for his life, being chased by armed assailants. He reaches his apartment building, drops his bike and runs inside. He pulls a digital camcorder from his backpack and is able to email out its contents before the men break in and asphyxiate him. This man, it turns out, is Leonard "Diddle" Callahan, and a college friend of Gus'. Shawn and Gus attend Doddle's funeral, where the minister says Diddle died from a hit and run accident on his bike. There, Shawn discovers, that not only was Gus in a singing group, but he has been estranged from Diddle, Tony and Joon for years and refuses to say why. Shawn also notices a mourner with a scar on his face who seems out of place there. Tony and Joon are able to speak to Shawn alone. They tell him Diddle was way too careful on his bike to die in an accident. They believe he was murdered, and they hire Shawn to find out what happened.