Thomas W. Hanshew 
Cleek: The Man of the Forty Faces [PDF ebook] 

What would you do if you had the power to change your appearance any time you wished? That’s the unusual ability that Hamilton Cleek exploited to become one of the most formidable thieves in history. But when the crook falls head-over-heels in love, he renounces his life as a criminal and becomes one of Scotland Yard’s top detectives. If Sherlock Holmes is a bit too stuffy for your taste, you’ll love the quirky detective at the heart of Cleek: The Man of the Forty Faces.