Fatal Convictions by Randy Singer has a very similar feel to John Grisham novels. It's a legal thriller... but the main character--a lawyer, of course--is also an evangelical Christian pastor. Not only that, but his client is a devout Muslim. I found it a very intriguing story, and very relevant to current events. Enjoyable read! (Click here for a free PDF of the first chapter.)
I received a review copy of this book from Tyndale House Publishers.