Defend and betray
(Book)

In Perry's third mystery set in Victorian London, military hero Thaddeus Carlyon falls from the top of a staircase and is impaled on a suit of armor below--an ignoble end to a distinguished career and a definite damper to the dinner party he had been attending. When his death turns out to be a murder, his wife takes sole responsibility and is quickly arrested. But Carlyon's sister believes the widow innocent and enlists the help of her friend Hester Latterly, a nurse, who soon brings in her associates from The Face of a Stranger and A Dangerous Mourning : barrister Oliver Rathbone and troubled former policeman, amnesia victim and dogged investigator Thomas Monk.