Dead Time by Stephen White

Dr. Alan Gregory and police investigator Sam Purdy are going through a possible mid-life crisis. A neighbor's sudden death has added a newly adopted son to Alan's life and his wife, Lauren and young daughter, Grace, are off to Amsterdam to look up Lauren's out-of-wedlock daughter born many years ago. As if this isn't enough, Alan's ex-wife Merideth has contacted him to hire Sam to locate her "baby", presently in the womb of the surrogate mother Lisa who has disappeared. Lots of stuff going on in this one, pheromones bouncing around all over the place. Interesting reading about the Grand Canyon. A pretty good read. Sandy P