If you took the scenes from Forrest Gump where Tom Hanks runs across the country several times and mixed that with some sections of The Time Travelers Wife, you'd have an idea of what this book is like. 
 Tim Farnsworth is a successful lawyer, and he lives with his wife Jane and their daughter, Becka, in upper middle class splendor. Becka has some weight issues and general case of teenage angst, but overall they're living the American dream. However, Tim has an odd problem. He has twice endured periods of time when he compulsively walks. When in the grips of one of these attacks, Tim will just start walking and is unable to stop himself. After the walks end, he falls into a deep sleep no matter where he is. This can be a tad dangerous if, for example, Tim happens to walk out into freezing temperatures and he isn't wearing his mittens. 
 The walking compulsion had vanished before, but it returns as the book begins. Since they've been through this twice, Tim and Jane know that doctors and psychiatrists can't help Tim, and efforts to drug or restrain him just make matters worse. With almost no hope of recovery or answers, Tim desperately tries to hang onto his job, and Jane's tries to help as they both struggle to maintain some semblance of a life. But the toll of dealing with Tim's condition is making life miserable for them, and things are about to get worse. 
 This was an interesting story, but a very depressing read. Tim and Jane are nice people who know they have it good, and are grateful and content with their lives. Reading about how this weird walking compulsion steals their happiness and normality is about as much fun as watching a sack full of puppies get drowned.