Currently Reading - Calibre, Ken Bruen

Felt badly in need of something pointed, dark ...

From the Blurb:

Somewhere in the teeming heart of London is a man on a lethal mission.  His cause:  a long-overdue lesson on the importance of manners.  When a man gives a public tongue-lashing to a misbehaving child, or a parking lot attendent is rude to a series of customers, the "Manners Killer" makes sure that the next thing either sees is the beginning of his own grisly end.