The Missing Chums #4

When brothers Frank and Joe Hardy embark on a new investigation for Police Chief Collig in Shantytown, their focus quickly shifts to a more personal crisis. Their close friends, Chet Morton and Biff Hooper, vanish without a trace after a motorboat trip, leaving the Hardy Boys to grapple with their unexplained disappearance. Compounding the mystery, Frank and Joe witnessed a bank robbery, and soon a web of crime unfolds, suggesting a connection between the chaos in Bayport and a shadowy group.

As the search for their missing chums intensifies, the brothers navigate treacherous twists, facing dangerous encounters and eventually tracing the kidnappers to a remote island. The stakes escalate when a ransom note arrives, mistakenly demanding payment for Frank and Joe, leading to a perilous confrontation with a gang of criminals who believe they have captured the Hardy Boys themselves. This thrilling mystery challenges their detective skills and courage as they race against time to unravel the truth and rescue their friends from an unknown fate.