Tracked by a Tattoo - Fergus Hume

Mysteries abound in this crime novel by Fergus Hume. Mr. Fanks, detective of Scotland Yard, is not all he seems, for when off-duty, he assumes his real identity of Octavius Rixton, well-to-do idler. When the scent of a murder reaches him, he is instantly Mr. Fanks and on the pursuit. A guilty looking innkeeper nicknamed Queen Beelzebub and a suspicious doctor named Renshaw further complicate his beginning investigation, and he finds the body is a man with a tattoo on his arm that has been partially obliterated by a knife. Where no one is as he seems the mystery can only deepen before its solution. - Summary by Don W. Jenkins