Someone is robbing Wormington's banks! Brothers Enrico, Theobald and Petros-the Troublesome Trio-together with their dog Lindy, are hot on the trail of the robber. The clues are baffling-people fast asleep in the banks, a mysterious whispery voice, a funny-looking rock. The search for the bad guy will take them farther away than they can imagine. What they don't know is that the robber is a master criminal who's tracking their every move. If they aren't careful they'll fall right into his clutches.