Set at the turn of the 20th century in Vermont, we follow the story of January, a young mixed race child in the care of a wealthy collector, Mr. Locke. Her guardian employs her father to travel the world searching for and obtaining rare treasures and curiosities, which are then added to Mr. Locke's extensive collection or sold at secretive auctions.
At the age of seven, while on a trip to rural Kentucky with Mr. Locke, January opens a dilapidated blue door amongst some ruins in a field and is briefly transported to another world, a world that smells of salt and stone, a world that feels strangely welcoming. Her few short moments there leave her wondering if it was a real memory or just her imagination. Then, at the age of 17, her father disappears while on one of his trips and a book mysteriously appears in a treasure chest in Mr. Locke's collection—a book that carries the scent of adventure and other worlds and tells of ten thousand 'doors'. And so begins an upheaval of January's life and the opening of new doors.