It is 1945, and London is still reeling from the Blitz. 14-year-old Nathaniel and his sister, Rachel, are apparently abandoned by their parents, left in the care of an enigmatic figure named The Moth. They suspect he might be a criminal, and grow both more convinced and less concerned as they get to know his eccentric crew of friends: men and women all who seem determined to protect Rachel and Nathaniel. But are they really what and who they claim to be? A dozen years later, Nathaniel journeys through recollection, reality and imagination to uncover all he didn't know or understand in that time, to piece together a story that feels something like the truth.