No, Misha Sherlock Holmes knows no peace! He should have been able to relax peacefully during the summer holidays, but he took on the absolutely hopeless case of the disappearance of a collection of paintings by famous Russian artists during the Civil War! And all because of Zhenya - the sister of Sherlock Holmes learned a lot of interesting, mysterious and tragic things from her great-grandmother's diary. The girl, of course, was interested in love, a broken heart and other romantic nonsense, but the astute detective missed the most important thing - the diary was about great cultural values and the brutal murder of the owners of the collection. In the old notebook, there were clues that made it possible to clarify where the paintings had disappeared, but almost a whole century had passed since the crime, and this dashed all hopes of success. But not for Misha Sherlock Holmes! Together with Zhenya, he went on a search, not suspecting that greedy criminals were following him, planning to get ahead of him and take possession of the ghostly collection.