In the remote town of Smolyan, Bulgaria, a murder investigation takes place inside a mysterious cave, uncovering a web of secrets and leading to a deadly religious conflict between two brothers.

The elderly Stoyan has advanced dementia and his daughter Iliana decides to organize a trip for him, in which Stoyan can see his sister and other relatives, her son Vesko can create precious memories with his grandfather, and she can spend her last days with what little is left of her father, who will soon know no one.

After the fall of the Berlin wall, now in his old age, the composer Edward Kazasyan discovers that his late wife, the singer Lia Ivanova, who survived communist labor camps, was forced to work for the secret services. Their dossiers in the State Security archives and her diary from childhood reveal the complicated fate of the singer, who strove the conquer the big stage while juggling a "second life" imposed on her by the system. Torn by doubts that his life was contrived and false, he once again relives their love and career in his loneliness, trying to find his place in this living puzzle.