from the back of the book:
When the vestry of St. Matthew's Church becomes the blood-soaked scene of a double murder, Scotland Yard Commander Adam Dalgliesh faces an intriguing conundrum: How did an upper-crust Minister come to die next to a neighborhood derelict of the lowest order? Challenged with the investigation of a crime that appears to have endless motives, Dalgliesh explores the sinister web spun around a half-burnt diary and a violet-eyed widow who is pregnant and full of malice - all the while hoping to fill the gap of logic that joined these two disparate men in bright red death...
Theology Today has a review.
I've read a couple of these, including the first one, and have enjoyed them. I will continue to pick them up and add them to my tbr stack, but I may start trying to read them in order.