Silken Prey by John Sandford

23rd book in the series and I don't think there's been a bad apple in the bunch. PW: Davenport is investigating another case when the trail leads to the man’s disappearance, then - very troublingly - to the Minneapolis police department, then - most troublingly of all - to a woman who could give Machiavelli lessons. She has very definite ideas about the way the world should work, and the money, ruthlessness, and sheer will to make it happen.