Clue of Coiled Cobra

The mystery begins when Ken and Sandy are driving home after covering a dog show for the Brentwood Weekly Advance. At a bus stop restaurant they offer a hitch-hiker a lift. When the boys realize that the mystery man had a bus ticket but used them for transportation anyway, the plot thickens. A private investigator, Andrew Richards, appears at the Allen's office and says that the hitch-hiker is wanted for the Plunket payroll robbery. He is identified as Fenton. Richards tells the boys that the cash from the robbery was never found, and that it may be hidden somewhere in the vicinity.

Despite getting mugged by unknown assailants Ken and Sandy trail Fenton to Kenshoa Park where they are outsmarted by their elusive prey. Still, it is apparent that this park holds the key to the whole affair and that the coils of a cobra figure prominently. While searching for clues in Kenshoa, during a carnival, the sleuths run into the Rands, Hiran and Limpy. The aura of evil hangs about them. But how do they fit in with Fenton and the heist ? It is only after Ken and Sandy are held captive in a cave and outwit their cobra guards, that the fascinating truth is finally revealed.