Varvara, a writer of detective stories, is accustomed to being in control—of her own life and that of her ten-year-old son, Ivan. But a single trip to the Fairytale Fair changes everything: together with a blacksmith named Dobrynya and his daughter Marya, they find themselves in a magical forest. Here, animals can speak, ancient magic thrives, and hidden among the trees lies a living *Teremok*—a sanctuary for characters like the Little Mouse, the Frog, Ryaba the Hen, the Wolf, the Fox, and the Seven Little Goats—which appears only in times of danger. The only way home is to find the Book of Secrets, hidden somewhere inside the *Teremok*. But they are not the only ones searching for it; the wicked sorceress Shishiga and the ancient warlock Voron are also on the hunt.