Paul Finchley (Coltrane) is a cherished household name, one half of a much-loved comedy double act with a career that spans several decades. He's a bona fide national treasure – until the day he receives a knock at the door. Faced with an accusation of long-past sexual offences, the life of this adored entertainer begins to unravel.Paul, and all those closest to him, are put under the intense pressure of the investigation and the merciless media circus that accompanies it, from his wife of 40 years Marie (Walters) and his troubled daughter Dee (Riseborough), to his manager and his loyal comedy partner, Karl (McInnerny).Throughout the investigation and criminal trial that follows, memories prove muddied, doubts flourish, loyalties are tested, and truths, half-truths and lies are all exposed.This powerful exploration of truth, memory, trust and family calls into question: how well do we really know those we love? The answer lies in a National Treasure.