This is a chilling mystery (the twist - the protagonist is a child psychologist) about parents suspected of harming their baby. It is a completely engrossing book -- I started to read it at a world-class resort in Hawaii, and I saw very little of the resort! After finishing Devil's Waltz, I read most of the other books in the series (there are quite a few) and I already have "EYES" looking for his next one!
It is brilliant to have the main character be someone OTHER than a cop or a jaded P.I.!! Having now read most of the books in the series, I am delighted by the development of all the leading characters across the years of the series. This book, I think, is still my favorite, though.
Kellerman is really skillful at maintaining continuity and evolving their personalities at the same time. I strongly suggest reading the whole series. I hope Mr. Kellerman never tires of Alex Delaware (the psychologist).