Where do heroes come from? How are friendships made? What makes us human? These are the questions that Lavie Tidhar grapples with, in this story of friendship writ large upon a canvas that stretches from the 1930s to the present day, in a slightly alternate world where superheroes exists, but heroics mean different things to different people. Choices made in the second world war resonate down through a series of brilliantly detailed cold war scenes, ultimately wrestling with the idea of the self. This is a big, ambitious book that manages to deliver. Expect nominations, awards, and Tidharian grumbling speeches.