Phantom Wings

Originally released serially in two issues of Boys Own Paper, vol 69 no. 10, July, 1947. Released in book format later that year.
"'Both the bomber and the atomic bomb are completely obsolete.' said the anonymous letter to the Daily Courier, 'and to prove this I will destroy Box Hill, Surrey, at four this afternoon.' 'Another crank,' said the Daily Courier lightheartedly, but it happened! ... Air Commodore Davies, the famous Flying Beetle of Air Intelligence, began his almost hopeless search with Scotland Yard and the Royal Air Force standing by to help."