Even in the case of an event as well-known as World War II, it is still possible to find a hidden gem that many people have never heard of. In the case of this book, that little gem is the pre-fabricated harbor built and designed by the British for the express purpose of supporting the Allied invasion of France on June 6, 1944. It was known as Mulberry, and the story surrounding its evolution from a controversial and often ridiculed idea into a controversial and often ridiculed maritime fact is as entertaining as it is educational.