Romka and especially his sister waited and waited for this day - and they waited! Finally, their friend Artem comes from England for the holidays, and now they will spend the summer in a big, cheerful group on the banks of the river, in a real estate. But the guys didn’t have a chance to calmly splash around in the warm water for long - one of their friends disappeared without a trace, and since he is the son of a banker, the conclusion suggests itself. But how was Nikita kidnapped from the estate, which was carefully guarded on all sides? Maybe the guards are in cahoots with the criminals, or is there really something involved here... a black ghost raven that the frightened cook saw?! The experienced detective Romka has been racking his brains for a long time, when suddenly on the most ordinary piece of paper in the most ordinary calendar...