Skip Case, by R. E. Derouin

The origin story--How They Met--which was more than a little creepy because David and Cynthia met when her husband disappeared. It is explained, at the end, that they dated for quite awhile before getting married to each other, which is good since the basis of this book is that Cynthia really loved her first husband; her going on dates with Dean just weeks after his disappearance rings a little off to me.

Anyway, the gist of the book was outstanding and complicated; I had no idea what was going on.