A group of young treasure hunters come to Cabot Cove looking for sunken treasure but after one dies and the other is arrested for her murder, Jessica gets involved both to clear a young man she believes is innocent and to help an old friend she knows tends not to be.

Magnum has been arrested for murder and it's up to super sleuth Jessica Fletcher to prove his innocence and find the real killer before it's too late.

Part 2 of 2. Part 1 is Magnum PI S07E09