There's been some discussion over at Ed Gorman's blog of Bill S. Ballinger, a sadly neglected writer whose books are worth rediscovery. One of them, The Tooth and the Nail, really knocked me for a loop when I first read it, more than 40 years ago. Ed isn't as taken with that one as I was, but he really likes Portrait in Smoke, which I also think is excellent. For that matter, what about The Wife of the Red-Haired Man and The Longest Second? Both thoroughly entertaining books.
Ballinger's technique was to tell two different stories, one in first person and one in third person, in alternating chapters. Eventually the stories come together, sometimes in surprising ways and sometimes in sadly inevitable ways. (And if you think that's an easy trick to pull of, just try it.)
Ballinger went on to do a number of paperback originals for Signet Books (and at least one each for Gold Medal and Pyramid). In the '60s he did a series of spy novels (again for Signet) featuring a character named Joaquin Hawks, and all of these are fun to read.
There are several of Ballinger's originals that I haven't read yet, including one called The Source of Fear, which supposedly has a lost city in it. I can't resist lost cities, so I gotta get to that one soon.
In 1993, Harper reprinted two of Ballinger's best in one paperback volume, pictured above. A real bargain if you can find it.