Nancy Caldwell relocates to an old sea captain's house on Cape Cod with her husband and four children. When she discovers an abandoned root cellar in her backyard containing a baby's skull and gold coins, she digs up evidence that links her land to the legendary tale of Maria Hallett and her pirate lover, Sam Bellamy. Using alternating chapters between the 18th and 21st centuries, The Old Cape House, a historical fiction, follows two women that are lifetimes apart, to uncover a mystery that has had the old salts of Cape Cod guessing for 300 years.