Mercy, fifteen years old, is the last of the Rathbone whaling clan. Her father has been lost at sea for nearly ten yearsever since the last sperm whale was seen off the coast of Connecticut. As Mercys memories of her father grow dimmer with each passing day, she spends more of her time in the attic hideaway of her reclusive cousin Mordecai. But when a strange and threatening visitor turns up one night, Mercy and Mordecai are forced to flee and set sail on a journey that will bring them deep into the haunted history of the Rathbone family.
From the depths of the sea to the lonely heights of the widows walk; from the wisdom of the worn Rathbone wives to the mysterious origins of a sinking island, Mercy and Mordecais enchanting journey will bring them to places they never imagined possible.