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Book 1: Detectives in Artek

The heroes of the story - a fragile young violinist Olenka and her friends Anton, Sasha and Sergey - while on holiday in a camp on the Black Sea coast accidentally learn about the secret of the jewels of the famous Milady, the heroine of the novel about the Three Musketeers, hidden nearby. At night, the friends secretly set off in search of the treasure, but find themselves in a whirlwind of exciting adventures. They will have to make a dangerous journey to the smugglers' cave and engage in a real fight with the thieves of museum valuables.

Who will win in the eternal battle of evil and good - cunning and hatred, or sincerity and friendship?

Book 2. Detectives from Artek. Secrets of the Stone Graves

The adventures of our good friends, the violinist Alyonka and her friends Anton, Sasha and Serhiy, continue! Exciting surprises and real challenges await the heroes. First, the guys come to visit Alyonushka in the glorious city of Lviv, believing that it is there that the Milady's jewels are hidden.

And soon, during the summer holidays, they are forced to go to the Stone Graves - because Alyonushka's father is in danger! Will the children be able to find the treasure, save their dad and keep their friendship?