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Eleven-year-old Petya took a radio-controlled helicopter to play with without asking. The helicopter's remote control exploded in the boy's hands! The toy's owner, Ruslan Barabanov, is in danger of getting into trouble with the police. On his instructions, detectives are looking for the person who actually stuffed the remote control with explosives. The helicopter was in a common vestibule for four apartments. The vestibule was locked with a key. This means that one of the residents of these apartments planted the explosives. But who exactly? The father of the accidentally injured boy - Artem? He had been feuding with Barabanov for a long time. Or maybe Katenka - an ex-girlfriend, a student at the chemistry department? She had a serious motive to take revenge on her former lover, Barabanov broke up with her in a very ugly way. But another person did it for her. In order to catch him, the detectives resort to trickery. #detectives #detective series