Episode 1

Since she was orphaned, Sue Trinder (Sally Hawkins) has been brought up amongst pickpockets and charlatans. She has been protected and cared for by Mrs Sucksby (Imelda Staunton) who believes Sue is too good a girl to get directly involved in such a world. But when Mrs Sucksby's old friend Richard Rivers (Rupert Evans) offers 20-year-old Sue £3,000 to assist him in one of his scams, Mrs Sucksby cannot resist. Passing himself off as a proper gent, Rivers has befriended a young lady, Maud Lilly (Elaine Cassidy), who stands to inherit a fortune when she marries. However, Maud's maid has recently left her service and, without a chaperone, Rivers' access to Maud is limited. He wants Sue to be accepted as the new maid and to help him win Maud over. Once married, Rivers plans to have Maud committed to an asylum and he will then take her fortune for himself. Arriving at Briar, the estate where Maud lives with her wealthy bookish Uncle Lilly (Charles Dance), Sue enters another world. Maud and Sue are of a similar age and appearance but their experience of life couldn't be further apart. Maud's existence is one of wealth and prosperity inside a grand house, where her duties are limited to nightly readings to her uncle and his friends. Over the course of a few months, Sue and Maud become friends. But Sue's growing feelings for Maud cannot prevent her from going through with Rivers' scam. On Sue's advice, Maud accepts Rivers' proposal of marriage. Will this event lead to Maud's demise and Rivers' great fortune? Now married to Maud, Rivers' next plan is to get her admitted to the asylum. But in a dramatic twist it is Sue that Rivers has certified. Suddenly Sue realises that Maud was in on the plan from the very beginning.