The true story of Charmian Brent (née Powell), the rebellious product of a strict 1950s upbringing, and her whirlwind romance with Ronald Biggs leading to a descent into crime, most infamously 1963's Great Train Robbery.

Sheridan Smith steps into the role of Charmian, the wife of the infamous great train robber, Ronnie Biggs. Chronicling Charmian's dramatic life, from that fateful moment when her path crossed with Ronnie (Danny Mays) as a teenager, to the devastating consequences of the Great Train Robbery in 1963. An event which left Charmian and her family on the run with one of the world's most wanted men. Facing an uncertain future in foreign lands, how long will they be able to avoid capture, with their young children in tow?

Tells the remarkable story of Charmian Brent - the ex-wife of Britain's most famous villain, Ronald Biggs. It focuses on her life from the moment she met and fell in love with Biggs, to their four years in Australia after the Great Train Robbery in 1963, to the heartbreak when he rejected her after he fled to Rio de Janeiro.