Never A Dull Moment, by Peter Cheyney (Fontana, 1961).From a
The So Blue Marble, by Dorothy B. Hughes (Dell, 1940).From eBay.
Shameless Honeymoon, by Thomas Stone (aka Florence Stonebraker)
Death Walks In Marble Halls, by Lawrence G. Blochman (Dell, 1942).From
The Star Trap, by Robert Colby (Gold Medal, 1960).From eBay.
Layout For Murder, by Jack Karney (Berkley, 1960).From eBay.