All of the Nicci French books, standalones and series work very well for me. There's that depressing tone you expect in a story about people who do horrible things, but there is also a strong sense of moral justice, kindness to the outcasts of society which is Christlike without being Christian (immigrants, the homeless, women, the mentally ill standing in for slaves, women, lepers, and the possessed) the importance of intervention, and so much about accepting the kindness of others. Everyone who knows Klein is devoted to her or in opposition to her, but there is no question that she deserves the devotion. Fortunately, she doesn't walk on water, only near it, so much walking, and such happy descriptions of what her little home means to her, and cats, and baths, and wines and tasty food. It's the same sort of mood that made the Richard Jury series a favorite. Because mysteries are involved with the restoration of order they often are very conservative. Not this series, though; Klein is a bomb-thrower at heart.
Klein is surrounded by people in harrowing circumstances and she does her best for others and herself. So the books are quite soothing, despite the dramatic tension.
Can't wait to have a go at the Saturday book.