Mark is a spy who returns home to Berlin from a mysterious espionage mission to find that his wife, Anna, wants a divorce. She won't say why, but insists it's not because she's found someone else. Mark reluctantly turns the apartment and custody of their young son, Bob, over to her. Later, he pays a visit to their flat to find Bob alone, unkempt, and neglected. When Anna returns, he refuses to leave her alone with the child but attempts to make amends. He stays at the apartment to care for Bob but Anna leaves in the middle of the night ...
