Lonely history teacher Barbara Covett's acerbic personality means she has few friends. When a spirited woman takes a job in the art department of the school where Barbara works, the elderly lady develops a dark obsession with her new colleague, and the discovery of an affair with a student sets her on a mission to destroy the life of her new 'friend'. Drama, starring Judi Dench, Cate Blanchett, Bill Nighy, Tom Georgeson and Michael Maloney