Murder at the Sanatorium

Lev Vaisman is a mathematician on retirement. He is used to solving problems with precision and logic, but when a famous detective novelist dies under strange circumstances at a sanatorium near Moscow, Lev Borisovich realizes: this is not a heart attack. The sanatorium is cut off from the world, there is no connection, and the murderer is among the vacationers. The mathematician has at his disposal only his sharp mind, his habit of noticing trifles, and a few days before the police arrive. He begins his own investigation. Why is the glass of water standing on the right if the deceased was left-handed? Where did twenty tablets disappear to from the bottle of heart medication? Who benefits from the death of the scandalous writer? Each of the guests has a motive, but only one is the exact solution to this puzzle. A classic detective story, where clues, characters, and logic intertwine into a gripping story about how even in retirement, intellect remains the most formidable weapon.