The Flame Dragon takes place three years after Timothy and David's first visit to the Dragonworld of Tey-Rah. Timothy, David, Dennis and Kat are now fourteen. Timothy gets a message from Menhir the stone dragon which tells him that the dragons are in trouble, and need help. The message asks if the four of them would come to Tey-Rah to look at the problem to see if they can help the dragons to solve it. Living in Tey-Rah, the four youngsters learn much more about portals, dragons and their world, and the nature of time itself. Kat falls in love with a baby dragon, Dennis shows true courage, and David demonstrates his knowledge of physics, while Timothy begins to question what the dragons are really up to, and starts to have doubts about the whole thing.