Written by Ashley Pharoah, this two-part adaptation of the much-loved John Meade Falkner novel is set in the small Dorset village of Moonfleet. In the story, young John Trenchard (Aneurin Barnard) is desperate to join the local band of smugglers led by Elzevir Block (Ray Winstone). Together they embark on an adventure full of action, friendship, and humour, and hunt for a fabled lost diamond. Their journey takes them from 18th Century Dorset, to the jewellery quarter of The Hague, and on to a gripping, final sea voyage. Sophie Cookson joins the cast as John's first love, Grace, who is also the daughter of Moonfleet's anti-smuggling magistrate, Mohune, played by Ben Chaplin. Omid Djalili appears as a diamond merchant, Aldobrand, and Martin Trenaman as the Turnkey.