In “What Is Not Yours Is Not Yours,” Helen Oyeyemi masterfully weaves together nine enchanting short stories, each featuring recurring characters and the motif of keys. These keys, whether literal or symbolic, unlock profound insights into the human condition. Oyeyemi, a celebrated British author known for “Mr. Fox” and “Boy, Snow, Bird,” skillfully blends fantastical and fairy tale elements into everyday settings, creating a unique genre often referred to as magical realism. Despite her own reservations about this label, her stories transcend the ordinary, inviting readers into a world where the mundane meets the extraordinary.