The Serpent of Rock Lake is book #2 in The Library Kids series andcontinues the adventure of Katie O'Conner and her friends after they finda secret library inside the Blue Mounds. Now they're on a mission tocollect twelve crystals in order to stop the Dark Master and the Enemies ofthe Library, once and for all. But finding the first crystal won't be easy.The Library Kids adventure continues as the group takes a trip back in timeto a Wisconsin homestead, which results in meeting Richard's maternalHo-Chunk ancestors and a mysterious 15,000 year-old leprechaun. A meetingwith Mother Earth and her eagle helper leads to a journey around the worldand a way to save a precious piece of land next to the Library. Eventually, the group must face the serpent of Rock Lake to retrieve the first crystal.