A contemporary series set in the Dublin underworld. Darren Tracey is on a flying visit from Spain to celebrate the release of his brother from prison. Tragedy strikes when his brother is assassinated. Darren is left to look after his sister - a single mum, who is deeply traumatised by their brother's death. Thrown back into the heart of gangland Dublin, Darren does a few 'jobs' for his old boss John Boy Power, played by the award-winning Aidan Gillen. His sister's sanity, the safety of her children and wanting a girl he can't have who's never stopped loving him complicate the journey to his ultimate goal: revenge.