A lot of women with manor magical abilities committed apparent suicide. Murphy from Chicago police Special Investigation unit asked Dresden to look into this. What Dresden saw is that a serial killer is on the loose who carefully hided his tracks. It turned out what one of the evidence points to a Warden of The White Council of wizards, and another one to Harry's brother Thomas.
This time Dresden encountered something that might take military force just to have hope of survival. Oh, and a lot of old enemies really pissed off at him. 3.5 - 4 stars.