The Mysterious Woman, The Deadly Secret, and The Unbelievable Escape!
This is Part 1 of 3 of Coffin for a Lady. Skip Turner and Captain Friday choose to save Judith despite the risk and leave the island. They succeed in eluding their pursuer and reaching the mainland. But when they get to the mainland, Judith vanishes. When the two men pursue her to a cabin and find a coffin, they understand that Judith is in serious danger.