The holidays continue! And for a whole month, the brothers Dimka and Alyoshka go to the Black Gorge on the seashore. Here they live with... a real Bigfoot, swim in the sea and catch sea fish. But somehow it suddenly became restless and alarming around. Either in the twilight a boat without lights will silently approach and disappear, or suddenly someone’s quiet mysterious voices will be heard in the night. And one day, just like in the local legend about black monks collecting skulls, a vague candle light appeared among the rocks. It seems that someone very cunning and insidious is doing his dark deeds here, confident that no one will ever unravel his secrets. “We’ll figure it out,” decide the brothers, who are not used to giving in to difficulties...