Searching for Elock

Eleven-year-old Tibby Brawlien has had a crazy summer. With the help of Elock, a strange-looking creature Tibby saw in his dreams, he and his new friend Fogel Jarker rescued a brother, his sister, and their parents from cave people. Tibby -- with Elock's help -- made Fogel, who was the meanest bully in school, Tibby's friend.
But was Elock actually a dream?
Another adventure begins when Tibby decides that Elock exists in the real world. To find him, he and his friends must enter a dangerous cave, contend with the cave people who live there, and get out before a nearby volcano erupts. Tibby believes they can deal with any challenges that come their way -- but what will happen when they finally meet Elock face-to-face?