"Engineers of Victory" is a new account of how the tide was turned against the Nazis by the Allies in the Second World War, the focus being on the problem-solvers: Major-General Perry Hobart, who invented the "funny tanks" which flattened the curve on the D-Day beaches; Flight Lieutenant Ronnie Harker "the man who put the Merlin in the Mustang"; and Captain "Johnny" Walker, the convoy captain who worked out how to sink U-boats with a "creeping barrage"....