Dasha was looking forward to an exciting theatrical training in a cozy guest house on the shore of Lake Pleshcheevo, and found herself inside a real detective! American Sam Goldberg, who came to Russia in search of a child he had never seen, never got to meet him - he was stabbed to death in his own bedroom. Because of the rain, the river overflowed its banks and washed out the bridge, blocking the road to the estate, so its inhabitants will have to investigate this crime on their own. It’s good that policeman Evgeny Makarov is among them. Dasha felt obligated to help him, because it was she, accompanying Sam as a guide, who invited him to come to this guest house...