Jermyn Street theatre, LondonKatherine Moar's bold and taut drama about the kidnapping of a fictional heiress explores the toxic inheritance of the 1970s Katherine Moar's riveting drama is inspired by the American heiress Patty Hearst who served a prison sentence for a bank robbery organised by a radical leftwing guerrilla group, the Symbionese Liberation Army. She had been abducted by the group months earlier and he…