 Among the many rules in Dinotopia is the edict that, once an outsider arrives, he or she is never allowed to leave.As Karl and David prepare to take their places in their new surroundings, both boys develop a strong bond with young Marion, who is on the verge of becoming a "matriarch" of the Dinotopian society.Legend has it that their ancestors lived in an underworld that was lit by sunstones.