As the curtains lift on the premiere episode of "This City Is Ours," Ronnie Phelan (portrayed by Sean Bean) strides confidently to the golf course, accompanied by Michael Kavanagh (played by James Nelson-Joyce). Meanwhile, Elaine (Julie Graham) and the ladies engage in gossip about the neighboring men. Davy Crawford (Stephen Walters) stands steadfast, holding the flag for Ronnie's impending swing. Alas, Ronnie's shot veers off course, missing its mark. He excuses himself momentarily to confer with Michael about bolstering their profit margins, despite Michael's conviction that they're already adequate. Michael is reluctant to tinker with success, but Ronnie broaches the idea of consulting their associates. He hints at desiring a bit more financial cushion to ease his tensions, suggesting they ponder over it further.
Later, Elaine raises a toast to Jamie's son, Alfie, amidst a warm and festive atmosphere. At the hospital, Michael waits anxiously for news, until he receives a cryptic message from "WhiteRose," informing him that flights have been arranged. He's then briefed on the procedure for providing his sample. Reaching out to Diana (Hannah Onslow), Michael reveals his location at the clinic, hoping she might lend a hand. Instead, she proposes an impromptu sex phone session, which Michael indulges in before heading to the club to meet Diana in the flesh. He confides in her about his low sperm count and infertility issues, to which Diana reassures him that there are alternative routes to conception.
Michael discloses his imminent trip to Spain, motivated by Ronnie's pursuit of a more lucrative deal. Ronnie also floats the possibility of stepping down, potentially paving the way for Michael to ascend. They converge with Banksey (Mike Noble), and subsequently join Ricky for drinks, where they toast to their camaraderie and commerce. Michael engages Stefania (Yolanda Vazquez) about securing the same product on more favorable terms, prompting Jamie Phelan (Jack McMullen)'s abrupt intervention. Stefania stresses the importance of a unified voice, while Ricky contends that a price adjustment necessitates other changes. Michael excuses Jamie and explains that he's there to learn, earning Ricky's acknowledgment that their dealings are with Michael alone.
Outside, Ronnie seeks Davy's counsel, querying whether he's on the right path. Davy expresses reservations about the risks involved. Ronnie delves into the status of his contact at the docks, learning that the man operates under strict confidentiality, only reporting if the container clears customs. Michael pitches to Ricky the idea of procuring earlier at sea and assuming the risk of UK border clearance themselves, asking Ricky to crunch numbers for a direct Liverpool shipment within two to three weeks.
Shortly after, Davy receives confirmation from his contact that the container has breezed through customs. He relays the news, stating it's passed smoothly. However, Davy's enthusiasm wanes when he's instructed to proceed with the plan. He contacts Ronnie with a bleak outlook. Meanwhile, Michael and Diana receive promising news at the clinic. When Michael reconvenes with Ronnie and Davy, they're informed by Davy's man that the container was dismantled, inspected, reassembled, and dispatched nonetheless.
He asserts that there's a lively buzz emanating from the dockside, accompanied by numerous beaming faces. Backslapping and camaraderie abound. Michael cautions that they must steer clear of the device, suspecting it to be laden with spyware, opting instead to lay in wait for its retrieval. Ronnie's discontent is palpable. Stepping outside, he confides in Michael that this is their maiden venture purchasing directly from the source, only to have their operation tank. He postulates that they might be dealing with a traitor within their ranks; if word gets out about the breach in their supply chain, predators will swarm to exploit it. They deliberate over the individuals privy to the operation, including Davy, Banksey, Jamie, and Bobby. Michael, however, stands firm in his conviction that they are all trustworthy. He maintains that the Amigos are strictly professionals who will still expect their due compensation. Ronnie realizes with a jolt that the culprit must be one of them and urges Michael to sift through the muck on the streets, promising not to forget his loyalty.
Later, Banksey assaults a dealer and hustles him into a vehicle, where Michael demands to know the source of the "lemon." In private, Michael informs Banksey that Ronnie intends for Davy Crawford's involvement to end. Banksey expresses bewilderment over Davy's potential motive.
At dinner, Ronnie probes Jamie about his reasoning behind asking Davy to be a godparent. Jamie, defending his choice, wonders why he shouldn't hold Davy in esteem. Ronnie persists, inquiring about Davy's redeeming qualities. Jamie responds that he's a nice guy, harmless. Meanwhile, Banksey and Michael break into an apartment, with Michael subduing a knife-wielding man and discovering the stash of drugs.
The following morning, Michael wakes Diana to discuss their upcoming christening scheduled for noon. He receives an unexpected visitor and a package containing a wrapped firearm. Michael calls Ronnie, expressing his discomfort with the entire situation, doubting Davy's capacity as a leader. He mentions cutting three kilos of high-quality weight and wonders about its origin. Ronnie suggests he'll ponder it but encourages Michael to proceed as arranged.
Davy works out at the gym, oblivious to the unfolding drama. Michael contacts Banksey, who confirms Freddie's presence at the gym and that he's been cleaned up and rid of incriminating attire. Freddie will alert them when Davy is on the move. Michael encounters Diana, who inquiries about the ongoing turmoil. He reveals the presence of a mole and assures her that once he deals with it, Ronnie will be in his debt. He envisions a future where they can act with impunity in three years' time. Diana, who has an appointment with her mother in prison, asks Michael if he's ever taken a life. He admits he hasn't but asserts he could if the situation warranted it, questioning if this would be a deal-breaker for her. Michael departs upon receiving the signal.
Davy exits the gym and embarks on a run, with Michael closing in. Shortly after, Jamie and Melissa arrive at Ronnie's house. Michael unwraps the gun, prepared to act. Ronnie's call reaches Michael mere seconds before he pulls the trigger, ordering an abort at the eleventh hour. Davy sprints past, oblivious to his narrow escape. Diana returns home to the sound of raised voices and engages in a video chat with her incarcerated mother, Lesley Williams.
Lesley inquiries about Michael's whereabouts, while Michael heads back to the clinic to refill his cup. Meanwhile, Jamie engages in conversation with Davy, who seeks reassurance of their well-being. Shortly thereafter, Diana arrives on the scene and makes her way inside. In a secluded area, Rachel Duffy (played by Laura Aikman), Elaine, and Jamie converse about Diana in hushed tones. Bobby Duffy (portrayed by Kevin Harvey) emerges from within to join their company.
Michael arrives at the church amidst the ongoing ceremony and finds a seat next to Diana. He whispers to her, inquiring if she is absolutely certain about embarking on a family life with him. As the evening progresses, they venture to a club to let their hair down. Diana broaches the subject of the rat, delving into discussions about her mother as well. She urges Michael never to exclude her from his life, insisting that she is not like the other women he has known.
When Diana is momentarily alone, Davy's wife, Cheryl Crawford (played by Saoirse-Monica Jackson), introduces herself. Cheryl remarks that she has never seen Michael so content, albeit hinting at his excessive drinking. Diana probes if this is her personal opinion or one echoed by others. She reveals that she has been with Michael for approximately 18 months. Cheryl laments the flaws in their respective partners, urging Diana to escape while she still can and offering to lend a listening ear if she decides to leave.
Ronnie confronts Michael, acknowledging that he was right about the situation and asserting the need to uncover the truth. They consult with Banksey on the matter. Michael is adamant that Davy lacks the courage to orchestrate such events solo. He suggests that information, albeit in drips and drabs, is starting to surface. Perhaps it's the stash of gear they had presumed lost. Davy contacted the port authorities and instructed them to let it go. Ronnie concurs to deal with him outside the UK, suggesting Spain as a suitable location.
Later, Ronnie spends time with Elaine and Davy, while Michael enjoys a swim with Diana, who admits she could become accustomed to such a lifestyle. She expresses curiosity about the disparity in their living accommodations, questioning why Ronnie owns a luxurious villa while Michael resides in a caravan. Rachel attempts to engage Bobby in conversation but is met with an unexpected flatulence. She then inquiries if Bobby has discussed her and her ideas with Ronnie, vowing to do so herself if he hasn't.
Michael invites Davy inside for a drink, with Ronnie trailing behind. In the garage, they ambush him and brutally end his life.
