Ken Bruen weaves a dark homage to Billy Wilder’s classic movie “Sunset Boulevard” in “London Boulevard.” Instead of a two-bit screenwriter, the protagonist is jaded ex-con Mitchell who views the world through a scrim of movies, novels, poems, and song lyrics. The crumbling mansion he’s hired to repair is in the affluent Holland Park district of London. And Norma Desmond’s stand-in is a has-been star of the London stage, Lillian Palmer. She’s “an expensive sixty” and still glamorous. Theater posters and portraits of her in her heyday remind Mitchell of “a laid-back Lauren Bacall with ferocity.” The enigmatic Jordan - is he the great actress’s butler or something more? - reminds Mitchell of “Oddjob from the Bond movie.” In the background, associates from Mitchell’s sketchy past are nipping at his heels, eager to harness his powers of ruthless persuasion in the messy business of collecting overdue debts.