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A lovely resort town by the sea. Palm trees, sun, clean streets, snow-white houses, carefully whitewashed fences, friendly residents...

Wealthy clients of an elite sanatorium, noisy rock festival participants, and guests of a small local hotel have an equally good time here. But all this idyll is for a time, for a while... Some rascal got into the habit of spoiling the snow-white walls of the houses with bizarre graffiti drawings. Because of these drawings, unusual events began to happen in the city. And then the unbelievable began... The genius of the criminal investigation, Major Ril Acorn, gladly leaving his beach chair, gets down to business.