In a residential street in Edinburgh, brothers Max and Jake run down an old man while Jake is driving them back from a wedding - stoned and uninsured. They carry on with their lives, hoping Walter's death will be passed off as natural causes, but the brothers end up being pulled further into Walter's world.

Max does his best to take control, while Jake finds himself falling in love with Angie, the dead man's niece.

Jake and Angie's blossoming relationship creates difficulties between the brothers, leading Max to take decisive action against his sibling.

When brothers Max and Jake unwittingly run over and kill an old man, their attempts to cover it up trigger consequences neither of them could ever have imagined.

Max and Erin’s relationship grows ever more complicated, as the pressure on Max from his police handler Jackie steadily increases, and he has a surprising meeting.

Max and Jake pick up arguments old and new, while the Lynch family face their darkest secret. Max offers Erin a way out but is running out of time to find one for himself.

Skye's plan to try and to scare off Danny and his gang backfires, while Max and Jake's pub in Chicago is heading for financial ruin. Meanwhile, Sir Jim Sturrock opens a community centre in Leith, and Teddy is managing a cannabis farm in the Borders for Maggie Lynch.

Max and Jake seek refuge with a face from the past in the Highlands, but Teddy is on their trail. Scotland’s national bank is being sold, and Maggie sees an opportunity.

Max, Jake and their new gang hide from Maggie in Edinburgh and discover her link to Sir Jim Sturrock. Maggie exerts pressure on Teddy, while Aliza risks the bank sale.

Max and Jake have a plan for final victory, but so does everyone else. Maggie’s enemies close in, and Sturrock’s bank sale is in danger.