Based on true events. Scotland Yard Detective Inspector Jack Whicher is sent to rural Wiltshire to investigate the horrific murder of a three-year-old boy. Paddy Considine,Peter Capaldi,Tom Georgeson,William Beck,Emma Fielding,Tim Pigott-Smith,Kate O'Flynn,Donald Sumpter,Ben Miles,Alexandra Roach,Jay Simpson,Peter Gordon,Charlie Hiett,Sarah Ridgeway,Ben Crompton,Ruairi Conaghan,Anthony Hunt,Julian Firth,Richard Lintern,Katy Murphy,Beth Cooke,Lizzie Hopley,Andrew Woodall,Antony Byrne,Lasco Atkins,Lucy Chappell,Lucy Scarfe