A fairy tale novella by the famous Soviet writer, playwright, and translator Alexander Melentyevich Volkov. It is the fifth book in the cycle "The Wizard of the Emerald City."
In this story, we learn about the awakening of the sorceress giantess Araхna, who five thousand years earlier had been put under a magical sleep for her crimes. Trying to seize power in the Wonderful Land, Araхna summoned the poisonous Yellow Mist, which covered the entire territory of the Wonderful Land. The inhabitants of the Wonderful Land were helped by Tim, Annie, and Charlie Black. To defeat the sorceress, they create an iron giant, Tilly-Willy.