Many people go to the sea to relax. But Venya and Varya go to the resort for extraordinary adventures! In an ancient fortress on the edge of a seaside town, they are looking for traces of a mysterious tribe of fire-breeders. The fact is that their friend, a professor nicknamed Dandelion, revealed an ancient secret known only to this people. And now he needs to find evidence of his discovery. But as soon as the guys rush to search, they notice that they are being followed. A few days later the professor disappears right from his room! It’s good that friends Venya and Varya have a mini-pig, Piglet. He will help them cope with the secret villain, and even with the invisible genie from the jug!