Finn Wallace is assassinated, throwing the criminal ecosystem in London into chaos. Ed Dumani - Finn’s best friend and second-in-command – attempts to calm things down by calling a meeting with the leaders of the other gangs of London, reassuring them that business will continue as usual. But this fragile stability is quickly undermined by Finn’s son Sean, who makes it clear that he is prepared to do whatever it takes to find his father’s killer. Tensions continue to grow on the morning of Finn’s funeral, as everyone gathers to mourn. But when news spreads that the Albanians may have been behind the kidnapping of Finn’s driver, it’s up to low-level Wallace henchman Elliot Finch to track down the missing man before anyone else. Creating as much chaos as he prevents, Elliot is taken deeper and deeper into London’s murky underworld in search of his prize – and his bravery and ability don’t go unnoticed by Sean Wallace.

Sean’s decree is final: no gang can operate in London until Finn Wallace’s killer has been found. Except the rule isn’t being applied to everyone. Asif Afridi – a powerful Pakistani gang leader - is still bringing heroin into the country. But when one of Asif’s shipments is raided, this unleashes a chain of events that threatens further violence. And leads Sean Wallace to discover that there are people close to him who have disobeyed his orders. But there are other problems to solve. A loyal employee of the Wallaces has been found dead – and with him, Sean’s best hope of finding his father’s killer. But everything changes when word reaches Sean that his father’s killers can be traced to a Traveller’s campsite. Whatever Sean chooses to do next, it’s not going to be quiet. Meanwhile, Elliot is sent on a mission to find Billy, Sean’s missing brother.

Lale has to be punished. She’s stolen from Asif and she‘s disobeyed Sean. But what does Sean have in store for her? Growing increasingly distrustful of those around him, he’s keeping his cards close to his chest. Even Ed isn’t in the loop, which is making him nervous. It’s up to Elliot to discover what’s really going on. And he knows it can’t be good – particularly when he meets a renowned and feared hitman that Sean has hired in from outside the organisation. Meanwhile, Lale’s true motivations become clearer. She has a shared history with Asif. One steeped in blood. But as Sean’s plan is brought out into the open, Lale’s problems will grow beyond Asif, until she’s forced to make an impossible decision. Will she choose her homeland or her family? Meanwhile Luan travels to Nigeria, looking to complete a deal that will make him a far bigger player in London. And Marian investigates what her husband was up to in the months before his death.

Something about Elliot just doesn’t add up. Ed knows it. He can smell it on him. But what does he really want? And where do his loyalties lie? After conducting an investigation into Elliot’s background, Ed lays out a test for Elliot that will show who he really is – and whether he is truly loyal to the Wallace Organisation. Elliot has no choice but to go along with Ed’s plan – but passing the test will take a terrible toll, both for Elliot and those caught up in the scheme. Meanwhile, Sean attempts to root out the rot at the heart of the two families. He knows he needs to make things right with Ed – and hatches a plan to bring everyone together. But Ed and Alex have been called elsewhere. Temptation and danger loom, as sinister figures set their sights on Alex. When Sean receives a call from Luan asking to meet, he’s dragged away from the safety of the family home. And with this, a dangerous foe smells an opportunity.

Somebody is trying to kill Darren. It’s not surprising, he did kill Finn Wallace. But with Darren now hiding in a farmhouse in the middle of nowhere, you would think that he would be safe. But he’s not. Can Kinney get to his son in time to save his life? Badly injured and unable to call ahead, he is forced to make a journey cross country, powered only by his desire to see his boy live. He’s seen the mysterious mercenary group that are hunting down his son first-hand – and knows that they are well resourced and well trained. What an unfolds is an action spectacular, that sees a small group of misfits trying to fend off an overwhelming threat. They can’t run. All they can do is fight. And in the midst of this, Darren is forced to reckon with everything that he has done.

How far is Sean prepared to go to uncover his father’s killer? Holed up in a safehouse with Billy and Marian, he is forced to confront uncomfortable truths about his family – and himself. But the truth has never been closer. The Wallaces have taken a hostage who knows the truth about the attacks on the family. As Elliot is brought further into the fold, he sets off on a mission with Sean to investigate the home of a mercenary that attacked them. Deeply troubled by what they uncover, Sean has to resist a dark temptation. Meanwhile, Alex uncovers a shocking secret about Finn’s killer – and resolves to reveal it to Sean, no matter what the cost. As the pressure on the Wallace family grows, Marian questions Sean’s resolve, whilst Billy falls further into despair. What will the truth cost the family? And is it a price truly worth paying?