A gripping and beautifully written account of the bravery and (some might argue) insanity displayed by the 617 squadron of the RAF during WWII, when they bombed the three main dams in Germany with a special type of bomb. That bomb sunk and then skipped over water until it reached the dam, then sunk again and created a massive crater in the structure, letting the force of the water do the rest - but that meant that pilots had to fly extremely low and in full view of enemy guns. The book also follows the story of the bomb's creator, Wallis, who is also responsible for the earthquake bomb. Going on to hail the squadron's success in bombing the Tirpitz off the coast of Norway and the V1 and V2 bunkers in France, it paints a detailed picture of the lives of these young men (20-25, some younger than that), and it reads like a thriller. Compared to other books about operations in WWII, this was published in 1969, so the pilots get a chance to say exactly what happened during their years at war. Filled with technical details, it might at times seem a bit heavy going, but the blend between science and action is useful, in my opinion. Would totally recommend it to any history nerd.