At first, I thought this is just a re-issue of Joshua Levine previous work, Forgotten Voice of Dunkirk, and released as a tie-in of the upcoming film of Dunkirk in 2017. However, it's not so. This is entirely new work with additional insights and correlation with the film. As historical adviser of the film,he also explained how several scenes in the film are actually inspired by real historical events which happened during evacuation of Dunkirk 1940.