A disappearance: Is it voluntary or involuntary? Antonis used to cut himself off from everybody and everything whenever he worked on a new film. He is a director, reserved but gifted. This time he has disappeared for an unusually long period of time. For Dimitris, his younger brother, who sets out to find Antonis, the mystery unfolds with difficulty. In Athens, France, Italy and Germany. Revelations are brought to light from minced words, which sound like riddles. This journey of despair and self-awareness comes to an end in the «Blue hour», when night is falling and everything clears up.