Grigoriy Ushakov was thought to be killed together with the distressed partisan party during the Great Patriotic War.However it turns that he lived a lot longer and fell the victim of the crime years after. Grigoriy’s corpse was found in one of the communicating courtyards. The investigator begins on the key of the past secret which concerns Ushkov and reveals the complicated story about the betrayal and revenge from the depths of times.