I know what I saw. Mahmud I.

inconceivable murder. And the only witness that no one believes is.

The once successful and wealthy banker Xander Shys now lives on the street and gets into fights with other homeless people. Once, having climbed into someone else's apartment to spend the night, Xander witnessed a cruel murder. But the police do not believe him, and he himself suffers from failures in his memory and remembers only excerpts.

, in an attempt to restore the events of that night with his characteristic mathematical accuracy, Xander is faced with memories of his past, all this time moved away to The backyard.

And no matter how difficult it may be, Xander intends to prove the truth, because he knows exactly what he saw.