In "Executioner's Heart--"the fourth Newbury & Hobbes steampunk mystery from George Mann--the detectives are up against the most frightening villainess England has yet seen.

It's normal for Charles Bainbridge, Chief Inspector of Scotland Yard, to be called to the scene of a crime, but this is the third murder in quick succession where the victim's chest has been cracked open and their heart torn out. Bainbridge suspects there's a symbolic reason for the stolen hearts, so he sends for supernatural specialist Sir Maurice Newbury and his determined assistant, Miss Veronica...