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Alla Ozornina is a contemporary writer, author of fiction and popular science books for children, recipient of the Governor's Literary Prize named after M. E. Vishnyakov, laureate of the International Literary Prize named after P. P. Ershov, and a member... of the Union of Writers of Russia. Can anything bad happen in the basement of a city library? Aside from books, dust, and excursion props, there is nothing else. But if you have a special smartphone – that's a different story. The treacherous gadget transported Nikita and the lingering Rita to the very same basement, only now it is not the 2020s of the 21st century, but the year 1916. The kids are about to meet people from the past, unravel the mystery of the ghouls, and find a way to return to their time. But the smartphone threatens to run out of battery and leave them stranded in the past forever. For middle school age.