As the publisher's blurb states:
Hastings vividly describes the evolution of Wallis’ bomb, and of the squadron which broke the dams. But he also portrays in harrowing detail those swept away by the torrents. He argues that what modern Germans call the Mohnekatastrophe imposed on the Nazi war machine temporary disruption, rather than a crippling blow. Ironically, Air Marshal Sir Arthur ‘Bomber’ Harris gained much of the public credit, though he bitterly opposed Chastise as a distraction from his city-burning blitz. Harris also made perhaps the operation’s biggest mistake – failure to launch a conventional attack on the huge post-raid repair operation which could have transformed the impact of the dam breaches on Ruhr industry.
Here once again is a dramatic retake on familiar history by a master of the art. Hastings sets the Dams Raid in the big picture of the bomber offensive and of the Second World War, with moving portraits of the young airmen, so many of whom died; of Barnes Wallis; the monstrous Harris; the tragic Guy Gibson, together with superb narrative of the action of one of the most extraordinary episodes in British history
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As the owner of four of Hastings' earlier books: "Bomber Command", "Armageddon", "All Hell Let Loose" and "Catastrophe", "Operation Chastise" is on my shopping list for what will almost certainly be a good read.