Just One Evil Act, by Elizabeth George

I liked this book quite a bit, though I agonized over Barbara Havers being such a lunkhead for such a prolonged period of time.  At the end of Believing the Lie, Angelina Upman had absconded with Taymullah Azhar's daughter Hadiyyah, after spending months seducing both Azhar and Barbara into trusting her.  In Just One Evil Act, Barbara does everything she can, and many things she shouldn't, to help Azhar find and reclaim his daughter. Perhaps the precipitating evil act is Angela's abduction of Hadiyyah, but almost everybody in the book has to deal with the repercussions of their own bad deeds.