Classic Robert B. Parker

In Book Two in the Ring of Five trilogy, Wilsons Spy Academy has called back their most brilliant trainee spy: Danny Caulfield. Danny is to be sent on an urgent mission: to find the treaty stone that protects the Upper World before the Ring of Five, leaders of the Cherbs, destroy it and wage war. Danny and his friend Dixie - a spy who can appear and disappear at will - must set off the Kingdom of ...