England, 1940. Barney's home has been destroyed by bombing, and he and his mother are traveling to the countryside when German planes attack. Their train is forced to take shelter in a tunnel and there, in the darkness, a stranger-- a fellow passenger--begins to tell them a story about two young soldiers who came face to face in the previous war. One British, one German. Both lived, but the British soldier was haunted by the encounter once he realized who the German was: the young Adolf Hitler.

The British soldier made a moral decision. Was it the right one? Readers can ponder that difficult question for themselves with Michael Morpurgo's latest middle-grade novel An Eagle in the Snow.