04/27/2015 A series of brazen cop killings in London kick-starts Casey's well-paced fifth mystery featuring Det. Constable Maeve Kerrigan (after 2014's The Stranger You Know). Kerrigan and her abrasive yet oddly loyal partner, Det. Insp. Josh Derwent, worry that the murders may be retaliation for the recent death of an unarmed teen at police hands, and a distrustful public makes for a difficult investigation. In addition, Kerrigan's boss, Supt. Charles Godley, seems to be buckling under the pressure of a terrible secret that only Kerrigan is privy to, but she has no idea how to help him. Kerrigan handles the daily tests of being a woman in a man's world with aplomb, but this case pushes her to the limit, both professionally and personally, as she strives to find a common thread among the victims. Intricate plotting and psychologically astute characters are a plus. A diabolically clever twist will leave readers agape.