The 8th Brodie Farrell Mystery, Closer Still is another book in Jo Bannister's impressive list of 30 or so books.
From the Blurb:
Detective Superintendent Jack Deacon doesn't take kindly to personal threats. So when a local gangster starts taking an interest in his partner Brodie Farrell and their infant son, Deacon is prepared to do whatever it takes to protect them.
It was later than he thought. He'd been in the back room of The Rose for hours, conducting business.