"This provocative and riveting four-part drama tells the story of Sugar (Romola Garai - 'Atonement', 'Emma') an alluring, intelligent young prostitute who yearns for a better life anyway from the brothel she is attached to, run by the contemptible Mrs Castaway (Gillian Anderson - 'Bleak House', 'The X Files').
However, things change for her when she meets wealthy businessman William Rackham (Chris O'Dowd - 'The IT Crowd'). Sugar is a thrilling antidote to William, who is saddled with a pious brother, Henry (Mark Gatiss - 'Sherlock', 'Doctor Who'), and fragile wife, Agnes (Amanda Hale - 'Any Human Heart', 'Bright Star') who regularly endures visits from the invasive physician Doctor Curlew (Richard E Grant - 'Gosford Park', 'Withnail & I').
William encourages Sugar as his mistress and she son frows accustomed to her new life. Yet unbeknownst to William, Sugar begins to hatch a plan which sets a series of events in motion that will change their lives forever..." -- from case