I just finished reading Robert Charles Wilson's, The Chronoliths. It's a sci-fi book about these huge monuments made of some exotic/frozen/indestructible substance that are violently appearing all across Asia. They are apparently shrines to a military leader named "Kuin" and they are inscribed with writing commemorating conquests 20 years in the future. More accurately the book is about a man, Scott, who finds his life intertwined in these events. It was a wonderful story. The characters were supremely developed and the plot moved along briskly. The physics of the time travel was kept at a "pop" level through the clever use of a first person POV from Scott in which he declared his understanding was only at that level. However, the book came up short in the end. I won't ruin the ending, but I just found the time travel logic way too faulty. It was almost as if Wilson hadn't thought it through, which is hard to believe when you see how much thought he puts into the characters.
I had essentially the same experience with his other work that I read not too long ago, Spin. The stories are quite similar in nature and both were beautifully written. I just need more resolution at the end. There is a huge sci-fi build up in both stories , and both leave you thinking, "Ehhh I dunno about that." Great reads certainly. A more human relationship-centric story than sci-fi, but slight let downs at the end.