The Face of Medusa (1967)

A few days before Filippos leaves London for a holiday on Crete, a Greek island, he sees that his girlfriend is cheating with his brother. He does not tell them anything about it, but during the holidays Filippos' brother disappears without a trace. Both Alexis, who is a homosexual and secretly in love with Filippos' brother, and his girlfriend put pressure on Filippos to indicate what he knows about the disappearance. However, Filippos sees this as the start of a dangerous game.