To drum up publicity, a novelist pens a treasure hunt book, burying real loot hinted at within its pages. A reader finds the treasure, but the chest contains the writer's corpse. Grey and Eddie must find the killer and the actual treasure, or Lime Street foots the bill.

A killer targets the royal family of a small European principality insured by Lime Street. To protect the last heir, Christina, Grey brings her to his US farm, but the assassin pursues them.