By George Ellis. Before there was David Grann's Killers of the Flower Moon, there was this version of the tale. You are probably better off with the Grann -- adverb-infested sentences like "Wordlessly, his guards stood stonily by" are not necessarily a selling point of the Ellis -- but this is a fantastic gift for case completists and/or collectors of fantastic cover art.
The 1964 paperback is in good, not great shape: a fold to the front cover, as you'll see in the pics; various creases to the back cover and spine; dings and rubbing to the edges; and page toning. The pages are holding, but I wouldn't F around and find out by storing it open-facedown while you grab a drink from the kitchen. But this one's rather rare, and a quick read at under 200 pp.