One year after the death of the fourth member of the infamous Gang of Four, the remaining trio of aged bank robbers is struggling to adapt to life outside prison walls. Having served their last stint in jail following a botched robbery of a closed-down post office, during which they donned gorilla costumes, hi-viz jackets, and colourful Bermuda shorts, the gang now faces a two-year suspended sentence and the challenge of honouring their fallen comrade's dying wish to stay on the straight and narrow. As they navigate the idiosyncrasies of their fellow residents at the residential home, the trio, now known as The Trio, must also contend with the suspicions of a relentless detective who believes their deceased friend is alive and well, secretly orchestrating a string of heists across the Home Counties. With the detective convinced that the coffin is filled with bricks and stolen loot, The Trio must prove their innocence while adhering to the terms of their friend's generous will. Amidst the chaos, the Colonel works on his memoir, 'Confession of a Bank Robber', and delivers after-dinner speeches to the legal profession. Jock finds himself as the kilted bagpiper for the Tartanettes, a troupe of middle-aged Burlesquers, while Lenny attempts to improve his social skills. As the three vow to honor their late friend's wishes, a series of copycat heists and odd mysteries come to light, threatening to unravel their newfound freedom and redemption.