This examination of a famous scandal from the 1970s explores the relationship between Barbara Baekeland (Julianne Moore) and her only son, Antony (Eddie Redmayne). Barbara, a lonely social climber unhappily married to the wealthy but remote plastics heir Brooks Baekeland (Stephen Dillane), dotes on Antony, who is homosexual. As Barbara tries to “cure” Antony of his sexuality — sometimes by seducing him herself — the groundwork is laid for a murderous tragedy.