I took plenty of books on holiday with me this summer and enjoyed them all. Even so, I couldn’t resist looking at the small library at the property we stayed in, which consisted of books that previous guests had left behind. You could see why they hadn’t bothered to pack them: most were tired, tattered paperbacks representing an unappealing mix of romance, thrillers, and historical fiction along bodice-ripping lines. But four of the books caught my attention, partly because they were in quite good condition; partly because they were by J Jefferson Farjeon, one of the writers of the “Golden Age” of detective fiction; and mainly because I was intrigued by the protagonist, Ben the Tramp. I read No. 17, Murderer’s Trail , Ben on the Job and Ben Sees it Through . The first Ben the Tramp novel, originally a stage play. Ben really is a tramp. He’s not Sherlock Holmes in disguise, and he’s not a toff slumming it. He’s a full-blown, hungry, homeless destitute in ragged clothes...