Joe and Frank are in Bermuda. Before they leave, a man who works for a someone who smuggles diamonds, needing money to pay back some people he owes, steals the diamonds and replaces them with fakes. His boss then gives them to his courier, a flight attendant on the plane Joe and Frank are on. So he goes to the airport and before it leaves, drugs the pilots, so while in flight, they pass out. So Frank and Joe try to fly but instead crash on an island and some of the passengers think they're in the Bermuda Triangle.
Did You Know?
When deplaning during the emergency, you see numerous men boarding the boats and rowing them. The plane should only have had 5 men, the three pilots and the Hardy Boys. See more