Sleuth, Harlot's husband, attacked Broker with the framed picture and killed Harlot with the knife when he caught them in the midst of their tryst/romp/rendezvous at their shared home. I'm guessing a whole lot of sex was involved. Debt-ridden Broker is married to someone else but keeps Harlot as his mistress because she's an addictive form of v e r y g o o d (sexual) distraction. In the beginning Harlot yields because her marriage to Sleuth is going nowhere either until she changes her mind and goes for Hypnotist instead. The pair planned a holiday together to Chicago (to meet Adel or what!) and were planning to leave the night after Harlot was killed.