Brimstone by Douglas Preston and Lincoln Child

I did not like how this ended!!  The story line was very interesting, dealing with the devil, or so we thought.  There were many twists and turns and travel.  We learned more about some of the core characters and a personal relationship blossoms.  Preston and Child do a great job telling a story and keeping you going.  There were many layers to this book and they were placed very well.  I had to keep reading to see what was going to happen and I continued to be surprised.  But, as I said, I did not like the ending at all.  I hope the next book will settle me down a little bit!!