Ondaatje clearly did a lot of research, and he‘s a master at creating images, and in this case, images of London in the aftermath of WWII and of shadowy characters. Spoiler alert: It was unclear to me at the end why Nathaniel wouldn‘t have taken some kind of action, learning that he had a child and that the knowledge had been kept from him. As a reader I felt confused and unsatisfied by his lack of action.