In a provincial town, a series of murders of lonely elderly people takes place. Another old woman dies—supposedly from a heart attack. Her grandson, who becomes the main suspect for the police, hires a private detective, Tatyana Ivanova, to investigate the death of Grandma Varya and clear him of the ridiculous accusations. Everything in the case suggests that the woman died naturally, with no outside involvement. If only it weren’t for one small clue: the keys to the front door, missing from grandma’s ring…
Tanya understands that things aren’t so simple. After questioning the neighbors, she learns that that evening—shortly before her death—the old woman was visited by a young woman…