A warden enters Leo's bar and asks if Walter remembers Eddie Ross, a Miami vice cop convicted of murdering his partner, Hogan, 20 years earlier. The warden believes that Ross — who's slated for execution in 24 hours — is innocent, and he hires Leo as Ross' lawyer.

Leo and Walter visit Ross in prison, where he admits threatening Hogan about his relationship with Gloria Pinault, but after learning that she'd been with other vice cops, he asked for a meeting to apologize. After doing so, Ross says that he heard a shot, saw Hogan's body, and shot at his killer. But the killer escaped, and neither of Ross' bullets were recovered. Will Walter try to find them and prove his innocence? Yes.

Back at the bar, Walter and Leo find Dr. Lance Sweets, an FBI psychologist who works at the Jeffersonian Institute and who's been sent to determine whether Walter's sane enough to work for federal agencies.

Meanwhile, rich teenager Kevin Montgomery spots Willa on the beach and invites her to a next-day party.

At a nightclub in Coral Gables, Walter, Leo, and Sweets meet Ross' arresting officer, Hank Coleman, a retired Internal Affairs cop. Sweets notices two guys in the club look like they're straight from the TV show "Miami Vice." Coleman explains that Bronski and Fontana are the retired vice cops who inspired the show; now they own the club. After Walter asks Coleman for directions to the old crime scene, he questions Bronski and Fontana, who admit having slept with Gloria.

After discovering that the crime scene is now covered by a storage facility, Walter builds a model crime scene based on trial transcript. Sweets watches, and they discuss how a bullet passing though a body would travel a quarter-mile.

Walter discovers that land in the area also has been paved over, and he asks Isabel to requisition a radar unit. Coleman arrives, admits Bronski and Fontana had been dirty, and that he also was intimate with Gloria, who disappeared after Hogan's murder. Coleman doesn't have her picture, but he does have a cassette of her singing.

Walter surrounds himself with various audio equipment and simultaneously plays different recordings until he finds one that matches Gloria's voice. Sweets is impressed.

Walter, Leo, and Sweets find Gloria singing in a bar under the name Chatney Dubois. She believes that Ross killed Hogan, but she says that she didn't sleep with Hogan, then she excuses herself "to sing for her supper." When Walter notes that informants also sing for their supper, she admits passing information to Hogan, who was investigating dirty cops. After he died, she went to France until just two years ago, but she still loves Ross.

Back at the bar, Sweets, who has been frustrated by Walter's flippant attitude, hypnotizes him and asks him to remember Iraq. When he does, a woman dancing with castanets appears. After Sweets pulls him out, Walter thanks him.

Walter, Leo, and Sweets return to the storage facility. Walter explains that Ross got the direction of the shot wrong because he heard the echo off his truck, adding that this is what he learned under hypnosis. He says that the bullet is in a nearby billboard.

Meanwhile, Willa goes to Kevin's party where Carmela snubs her, so Willa steals Carmela's convertible. Kevin joins Willa and starts driving recklessly.

Isabel reports that the ballistics are inconclusive, but the billboard bullet wasn't fired from Ross's gun and it matches a bullet found in a veterinarian who was murdered the day after Hogan was. Walter believes that Ross' shot hit the killer, who went to a vet instead of a hospital whose staff members would report the incident; he then killed the vet to cover his tracks.

But Walter says that the ballistics are inconclusive, because they're looking for the wrong gun. Since casings for these bullets are the same diameter, the killer shot Hogan with a .357 loaded with .38 ammo.

Walter and Sweets revisit Bronski and Fontana to ask about their weapons. Bronski packs a .45 and Fontana a 9 mm, but Internal Affairs carried .357s. When Walter asks Coleman if his noticeable antacid consumption is connected to the painkillers he's using because the bullet Ross fired is still inside him, Coleman pulls a gun and fires. Walter dives behind the bar.

Bronski and Fontana fire at Coleman. Bronski runs into a wall and gets knocked out. Walter grabs Bronski's gun and tells Coleman that he can either walk away or kill him. Coleman walks, daring Walter to shoot him in the back. Walter fires.

Meanwhile, as Kevin walks away from the car he's just crashed, Willa pulls cash from the wallet she's stolen from Kevin, tosses the wallet into the wreck, and heads in the opposite direction. A patrolman spots the wreckage and arrests Kevin.

Walter tells Leo and Sweets that Coleman favored one side, so he shot him in same place where Ross' bullet still resides. Isabel confirms Walter's theory, adding that Coleman killed the vet because he wouldn't remove the bullet. Coleman gets handcuffed, and Ross is released into the waiting arms of Gloria.

Back at the bar, Sweets summarizes: Coleman caught Bronski and Fontana pocketing cash, and he took a cut to ignore this. When Gloria discovered Bronski and Fontana were dirty, she told Hogan, who told Coleman, who knew Bronski and Fontana would flip on him, so he killed Hogan.

Willa and Isabel learn that Walter failed Sweets' insanity tests. Leo asks Walter to tell Sweets what compels him to find things. OK: Walter was in a Humvee, looking for an insurgent Iraqi bomb-maker who made an IED that killed everyone inside except Walter, who awakened two months later. Now he either finds what he's looking for or dies trying. Satisfied, Sweets says that he'll sign off on Walter for six months.