Ken Bruen 
Blitz [EPUB ebook] 

The Cop Detective Sergeant Brant is tough and uncompromising, as sleazy and ruthless as the villains he’s out to get. While his violent methods may be questionable, Brant always gets results.The Killer A psychopath has started a killing spree across London. Calling himself ‘The Blitz’, his weapon of choice is a workman’s hammer. And his victims are all cops.The Target The police squad are desperate to catch the killer before he catches up with them. And Brant is top of his list…