Ending with a resolution where the treasure is found, but it's a historical artifact rather than wealth, emphasizing preservation over greed. Wrap up character arcs, maybe hint at future mysteries in the series.

Potential pitfalls to avoid: Making the mystery too convoluted. Keeping the clues too obvious or too cryptic. Ensuring all introduced characters have a purpose. Avoid clichés in the mystery elements. Balance description with action to maintain pacing.

During a midnight dive, Amelia uncovers a hidden cave mouth beneath the lighthouse. Inside, she finds the sunken remains of the Cursed Mariner (1892), a ship lost during a hurricane. The trident symbol appears etched into its rusted hull—and in the log, she discovers a harrowing account of the crew’s murder by a phantom ship, a ghostly vessel now haunting the cove.