For the first 100 or so pages of "On Borrowed Time", I was mesmerized -- just couldn't put the book down. Others have described the plot, so I'll be brief on that. Our hero, Richard Kilmer, is spending the holidays in upstate New York with the family of his fiance, Jennifer, when they get into a car accident. He regains consciousness to find that Jennifer has disappeared, her parents don't recognize him, and, as he canvasses his and her friends, no one but he remembers her existence. They all think he's lost his mind. Eventually Kilmer meets Allie, a woman who looks exactly like Jen, and who may be her twin sister, except that Allie's missing sister is named Julie. Together, they try to discover what's going on.
I absolutely love Rosenfelt's books, especially the dog-friendly Andy Carpenter books. In "On Borrowed Time", he took on a very ambitious project and to me, did not entirely succeed. At some point in the story the general outlines of what has to be going on become clear to the reader, but not to Kilmer, although Kilmer has all the relevant information. OK, well maybe Kilmer is just unwilling to believe it, which would be natural in real life. But at that point in the book, I started to react to Kilmer the way I react to heroes who go to a rendezvous in a deserted alley at midnight alone, and without telling anyone where they are going. Wake up, dummie! This, and a couple of other things (which I don't want to reveal) reduced my enjoyment of the whole. Never mind, it's still a fun read, and you can do it in a day.