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Henry, Jessie, Violet, and Benny, visiting a New England fishing village, decide to investigate the truth behind the legend of a ghost ship that townspeople claim sank off the coast and reappears on stormy nights.

Spring special." The Alden children suspect that the other guests are somehow involved when things begin to disappear at the bed and breakfast where they are staying in Washington, D.

The Alden children hunt for their late grandmother's necklace that has been missing for years.

While visiting the Florida Keys, the Aldens encounter suspicious characters, strange incidents at night, and a plot to steal valuable coral.

While exploring the caves around Dragon's Mouth Cavern, a series of unusual and somewhat frightening events convinces the Alden children that someone does not want them around.

Henry, Jessie, Violet, and Benny, attending an astronomy conference with their grandfather at Mountvale College, become involved in a mystery when a student who is slated to make a presentation about an outer space discovery learns that his research paper has been stolen.