Dink, Josh, and Ruth Rose help catch the thieves who have stolen gold from Sammi's parents, the king and queen of Costra.

Frank and Joe Hardy, agents of the top secret American Teens Against Crime organization, cannot believe their luck when they are sent to a local diamond show and assigned to guard supermodels--who just may be diamond thieves.

Dink, Josh, and Ruth Rose investigate the theft of a great deal of money from the belly of a nearly life-size Tyrannosaurus Rex model that their friend, Jud Wheat, is using to raise money for a dinosaur museum.