Born into a humble mining community, Rhianon and Sabrina Webster live with their stern father, both planning very different futures. Edwin dotes on his youngest daughter, beautiful, flighty Sabrina, but it is homely, steady Rhianon who keeps their little family together. Until one fateful day when principled miner Pryce Pritchard, the man Rhianon loves, gets into a fight. All their worlds are turned upside down when Pryce is arrested and Sabrina disappears after a bitter row with her father. Months later, after visiting Pryce in jail, Rhianon chances upon Sabrina - pregnant and now living in squalid lodgings in the poorest part of Cardiff - and decides to stay and look after her. But when the baby is born Sabrina wants little to with him and returns to her flighty ways - she is determined to have the life of riches she has always craved. Kind-hearted Rhianon looks after the little boy and patiently awaits Pryce’s release. And then Sabrina tells Rhianon that Davyn is Pryce’s boy. Believing that Pryce no longer loves her, a heartbroken Rhianon returns home with Davyn to her now forgiving but broken father and tries to make ends meet. And after three long years, Pryce is due out of prison. But which sister will he turn to? Set in 1920s Wales, AT SIXES AND SEVENS tells the gripping story of two sisters, driven apart by their love for the same man and the choices they are forced to make for their very different futures.