Victor Baxter is a young boy when a secretive stranger known simply as "the Captain" takes him from his boarding school to live in London. Victor becomes the surrogate son and companion of a woman named Liza, who renames him "Jim" and depends on him for any news about the world outside their door. Raised in these odd yet touching circumstances, Jim is never quite sure of Liza's relationship to the Captain, who is often away on mysterious errands...