Svetlana Vetvinskaya’s only 23-year-old daughter Masha committed suicide. The inconsolable mother asks Beagle to find out the reason why Masha did this. Having studied her past, Alina makes the assumption that the girl, apparently, did not need any special reason to commit suicide. Apparently, Masha was very lonely. However, after an investigation, detectives put forward an unexpected version - it is a murder. It turns out that Masha turned out to be a victim of her own cruel plan: to take revenge on her mother for her warped childhood.