The Hook (also known as To Agistri) is 1976 giallo film directed by Erricos Andreou and starring Barbara Bouchet.
Kostas is a powerful tycoon with a beautiful wife, who is cheating on him with a young playboy. Unbeknownst to Kostas, the two lovers plan on killing him.
One reviewer said, "The film has cult status among many giallos lovers, but its characters are flat and its story is inconsistent in its surprising twist, invalidating as implausible the police investigation in pursuit of arbitrary impact."