When he finds a clue to a mystery in his tree house, Todd enlists the help of his third-grade classmates to identify the trespasser who had left it there.
Despite attempts against their lives, Frank and Joe accept a case involving the most powerful man in a small town in Georgia and an allegation of piracy and smuggling.
As Nate the Great sets to work on his first international case, he searches for a lost "something" and saves the King of Sweden from a troublesome traveler.
Jeff, already worried about losing his place on the hockey team because of low grades, suddenly finds himself the victim of sabotage in the form of forged papers.
