Griswold, The Tenth Parallel: Dispatches from the Fault Line Between Christianity and Islam. This one recommended by a fellow Elder at church this morning. May buy it. (Fixed the link.)
UPDATE: I acquired this book, read a couple of chapters, didn't like it, and put it down for good. Among the author's views seems to be one that holds that Christianity and Islam are morally equivalent religions. The author is a globetrotting journalist whom one can credit with a lot of courage, a Yale grad, and the daughter of a presiding bishop of the Episcopal Church. But no to her book.