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During the holidays, one of them made a new friend, another had a vivid experience of a trip to the seaside, and Clava and Renaud had strange spots on their wrists. When the girls come across the third element of the drawing, which is the sum total of all the symbols on their hands, they come to their senses several centuries earlier. And they realise that they are trapped - time travellers!

Now the girlfriends will have to keep themselves hidden among the Cossacks, master the Sich traditions and find a traitor to right a terrible wrong and save the honour of a good family. And most importantly, they will have to find a way to return to their families and their normal lives. Although now it will never be the same again.

A fascinating, insightful, and at the same time informative book for anyone who loves adventure and the search for truth.