As the seventh adventure in Robert Arthur's classic mystery series begins, thirteen plaster busts arrive at the Jones Salvage Yard. Soon, Jupiter begins to suspect they are more than they appear, and after some of them are sold, Pete, Bob, and Jupiter have to track them down and decipher a riddle to help their new British friend August August claim his extraordinary inheritance. But several dangerous men are also on the trail of the Fiery Eye. Which one of them will get there first - or will the Three Investigators trump them all?