Authors are always looking for new angles for thrillers, which means finding new professions for their protagonists. In Carlton Keith's A Gem of Murder, the main character Jeffrey Green is a document verifier. But he's no dusty old senior with bifocals—no sir. He's an ass kicking, woman chasing, tough-as-nails, he-man. He's asked to confirm whether two writing samples from decades apart are by the same hand, soon learns that a fortune in jewels have gone missing, and encounters many people interested in ascertaining their whereabouts. Despite the document verifier gimmick, the book is a standard mystery, though it tells the reader where the missing jewels are in the first few pages (as does the rear cover). Keith's try at something new could have used more heft, more peril, more propulsion, and probably better writing in general. That's not to say it's bad. It's just that despite its innovative lead character and cleverly hidden jewels it doesn't separate itself from the pack. Originally published in 1958 as The Diamond-Studded Typewriter, this retitled Dell edition with wonderful Harry Schaare cover art came in 1959.