A Wall Street Journal 20 Best Children's Books of the Past 20 Years Selection! Chirri and Chirra go underground in this charming addition to the Chirri & Chirra series. Behind a hole in their basement wall, Chirri and Chirra discover a network of tunnels. Join them as they visit moles, discover caves full of glowing flowers, poke at the roots of growing plants, traverse a subterranean lake, and spend the night with a family of badgers! The fourth book in the Japanese Chirri & Chirra series, this underground adventure is sure to charm and delight.