The Frightened Man is a 1952 private eye novel by Laurence Meynell, one of those writers who enjoyed quite a bit of success in his day only to later disappear into complete oblivion. It's bright and breezy, moderately hardboiled in an English sort of way and with some humour. It’s the kind of competently executed harmless entertainment low-key thriller that was so typical of its time and I enjoyed it.
Robert van Gulik's The Chinese Nail Murders was the fifth of his Judge Dee mysteries, set in Imperial China during the Tang Dynasty. It was published in 1961. As in most of the Dee novels there are three separate cases being investigated simultaneously.
Nobody ever did historical mysteries better than van Gulik. This is terrific stuff.
Seven Clues in Search of a Crime is a very clever and intriguingly unconventional 1941 mystery by Bruce Graeme and it’s a very bookish mystery - the amateur detective hero is a bookseller and aspiring crime writer. It's great stuff.
Lawrence Block's Borderline (a very early book written in 1962) is either a sleaze novel with significant noir fiction overtones or a noir novel with signifiant sleaze overtones. It should satisfy hardboiled noir fans.