The Secret of the Old Mill
Dixon, Franklin W. Frank and Joe help prevent Ken Blake from getting killed in a cycling accident. The Hardy Boys learn that their friend Chet Morton was swindles when he made change for what turned out to be a counterfeit twenty dollar bill, something that the police later confirm is becoming more common in their town of Bayport.
Later, Joe is awakened by a clattering sound and sees a mysterious figure bicycling away from the his home. While investigating the...