After Astri’s mother dies, her father decides to leave Norway to seek his fortune in America. He sends Astri and her sister Greta to live with their aunt and uncle. Her aunt sells Astri to a mean goat herder who abuses hardworking Astri until she runs away. Astri returns to her aunt and uncle’s house to get Greta so they can follow their father. They travel to the coast and find a boat bound for America. Astri pays for her passage and Greta stows away. The voyage in steerage is treacherous with rough seas and disease.
When seven-year-old Sophie Crue and her father left Guam, her scientist mother stayed behind, working for Corpus on Skin Island. Much later, seventeen-year-old Sophie gets an emergency email from her mother. On Guam, no one will fly Sophie to mysterious Skin Island. Jim , a childhood friend, reluctantly agrees to take her and the plane is damaged on landing. Sophie goes with island resident Nicholas to find her mother, but becomes suspicious of him. Sophie slips into a room to find Lux sleeping – a girl who looks exactly like her.