Mahmood Mattan is a fixture in Cardiff's Tiger Bay, 1952, which bustles with Somali and West Indian sailors, Maltese businessmen and Jewish families. He is a father, chancer, petty criminal. He is many things, but he is not a murderer. So when a shopkeeper is brutally killed and all eyes fall on him, Mahmood isn't too worried. Witnesses allegedly saw him enter a shop that night and love lends him immunity too: the fierce love of his wife, who forgives his gambling in a heartbeat, and his children. It is only in the run-up to the trial, as the prospect of returning home dwindles, that it will dawn on Mahmood that he is in a fight for his life - against conspiracy, prejudice and cruelty - and the truth may not be enough to save him.