Electra (Irene Papas) and brother Orestes are separated when their mother and her lover kill their father Agamemnon after his victorious return from battle. She marries a poor but honest farmer to escape from her murderous mother's home. Years later, Orestes and Electra are reunited as adults. the two plot the bloody murder of their mother to exact revenge for their father's death. The story is taken from the tragic play by Euripides, with screenplay and direction from Michael Cacoyannis.