Lost City (Dinotopia)

Andrew the son of a Dinotopian innkeeper makes a strange discovery one night when a hooded dinosaur leads him and two friends to a remote sealed-off city. When they begin to explore the forbidden area the trio are thrust into a dangerous adventure--one they can survive only if they can put aside their chronic rivalries and come to understand the lost race of Trodons who have existed there in seclusion for centuries.