George Allan England 
Flying Legion [EPUB ebook] 

The hero/super-villain of the story is an ex-army guy, who’s somehow a millionaire and inventor extraordinaire. He also only likes to be referred to as ‚The Master‘ (one of his many super-villain traits). Bored he decides to recruit some other ex-military types for an unknown venture. These are joined unexpectedly by the mysterious Captain Alden who wears a face mask to cover his disfigured continence. Part one of the plan involves high treason against the United States, part two of the plan involves a military assault on Mecca. (Goodreads)