In Morriston Hospital in Swansea in 1994 a group of ordinary middle-aged Welsh men stepped into the unknown by taking part in the world's first medical trials for the drug that became Viagra.

In the valley of the Black Mountains, Aled must bury his father, and help his mother find peace. An outsider in a tight mining community, Bethan reveals what really happened the night Llewelyn died. The will of a father, broken by the courage of a son.