The episode begins with Carter learning about Eddie's son's tragic death from a drug overdose. He confronts Eddie about it, but Eddie is ashamed to admit that his son was a junkie. Carter then tricks Eddie into revealing whether he is working with the Customs office.
Carter lures Eddie into a trap by pretending to be concerned about his son's death and asking if he is working with the Customs office. Eddie falls for the bait and relays information to Bailey, who has the location raided. During the raid, Carter spots Bailey and immediately recognises him. Carter calls Hakan and reveals that Eddie is a traitor, forcing them to change their plans.
Aziz later calls Guy and asks to meet him in person. Meanwhile, Carter sends two gunmen to kill Eddie, but Eddie manages to escape. He later meets Bailey and reveals that Carter now knows the truth about him. Eddie tells Bailey that he is leaving Liverpool to protect his family. He also promises that once his family is safe, he will return to kill Carter himself. Bailey tries to stop him, but Eddie refuses to back down because he knows exactly how Carter operates.
Elsewhere, Hakan and Aziz meet Guy in Turkey and collect the drugs from him. They explain that because Eddie turned out to be a traitor, they can no longer continue with the original plan of sending Eddie to London with the drugs. Aziz tries to reason with Guy and eventually convinces him to hand over the shipment.
Back in London, Angus is furious with the team for allowing the Turks to bring such a massive quantity of drugs into the country. Guy and Bailey begin blaming each other for the mission falling apart. Kate offers to seek Goodwin's help, but Angus is not comfortable with the idea. Don suspends Guy and orders him to return home.
Guy returns to Sophie and struggles to settle back into normal life. He explains that the mission is still ongoing despite being removed from the operation. Later, Guy goes out into the city with Sophie and Lily, but notices a Turk on the subway watching him. Sophie senses the tension and takes Lily away while Guy threatens the man and demands that Hakan pay him for the job.
After the incident, Guy apologises to Sophie, but she tells him to finish the mission properly before trying to return to his old life. Guy later meets Don again and asks to rejoin the operation. Despite Don's warning, Guy decides to return to work.
What transpires for Carter? In the meantime, Bailey, posing as a lawyer, pays a visit to Goodwin. Claiming that Carter had sent him, Bailey offers to aid Goodwin and deliberately goads him into divulging information about Carter. During their conversation, Bailey learns that Carter is fiercely protective of his mother. He subsequently enlists Kate to delve deeper into Carter's mother's background.
Kate and Bailey track down Carter's mother's address and eventually uncover Carter hiding there. Concurrently, Carter's mother berates him for the life choices he has made. She warns him that the Turks could end his life and urges him to swiftly retrieve the drugs. She also tells Carter to remind the Turks of his true identity.
Later, Carter meets with Hakan in private and inquires about the drugs' whereabouts. Hakan explains that the shipment is currently in Yugoslavia and will pass through Germany and France before entering Britain via ferry. Carter requests that Hakan and Aziz leave the drugs in Germany so his own men can collect them from there.
Elsewhere, Guy enlists Mylonas's help in reconnecting with the Turks, reminding him that the drugs have already entered England. Initially resistant, Mylonas claims that he owes England nothing after the treatment he received there. However, Mylonas eventually agrees to help Guy out of friendship, even though he believes Hakan will kill him for it. Guy returns to work later, praising Bailey's efforts. Together, the team begins devising a plan to intercept the drugs.
Meanwhile, the Home Secretary orders Angus to immediately shut down the mission. Angus refuses, explaining how perilous it would be to abandon the operation when two tonnes of heroin are about to enter Britain. He informs the Home Secretary that he still trusts his team and requests more time.
At the same time, Kate and Bailey follow Carter's mother as she travels to Hamburg by ferry. Erin, who reveals her proficiency in German, joins the operation to assist them. In Germany, Carter's mother and her men prepare to hand over the drugs to Hakan's transporter.
Erin approaches a group of German officers and convinces them to inspect the bus carrying Carter's mother. The police halt the bus for inspection, delaying the drug exchange.
Meanwhile, Guy meets with Aziz and asks him to partner with him in a future business venture. Elsewhere, Carter informs Hakan that he failed to collect the drugs due to Customs interference. As they search for another way to transport the shipment into Britain, Guy arrives and offers to transport the drugs himself since both Hakan and Carter are being monitored by Customs.
Hakan agrees but orders Guy to leave Mylonas behind. He also threatens to kill Mylonas if Guy fails to deliver the drugs into the country.
As the storm rages, the crew of the damaged vessel—Don, Bailey, Kate, and Guy—are forced to abandon ship and take refuge in their lifeboats. With the drugs securely tied to a second lifeboat, they continue their perilous journey toward London. The winds howl and waves crash against them, but their resolve remains unwavering.
Erin, separated from the group, struggles with the loss of communication. Angus, her faithful companion, reassures her, urging her to trust in their abilities and promising that they will find their way back. The storm subsides, and the crew fires an SOS flare, finally reconnecting with Erin and Angus. Don orders Angus to arrange a van and send backup officers to apprehend both the Turks and Carter's gang.
The mission reaches its climax at the handover point. Don and the team wait outside while Guy enters a warehouse to deliver the drugs. He hands the shipment over to Hakan and accepts the payment. Just as Hakan prepares to leave with Aziz and Carter, the police storm the warehouse. In a desperate bid for freedom, Hakan escapes through the roof, but Aziz and Carter are arrested. Fleeing, Hakan unwittingly enters Zeki's old apartment. Zeki's mother recognizes him and alerts the police, leading to Hakan's arrest as well.
The operation is a resounding success. Bailey calls Eddie to inform him of Carter's arrest. The drugs are confiscated, and the Home Secretary proudly poses with the seized two-tonne heroin shipment. Angus officially declares the mission a success, and Don dismisses the team with a few final instructions.
Guy says goodbye to his comrades as Kate, Erin, and Bailey head out for drinks together. Guy finally returns home to his family but struggles to sleep peacefully as the episode comes to an end. The weight of his past and the triumph of their mission linger in his mind like a haunting melody that refuses to fade away.
