This is another "have now read" rather than currently reading, but I felt an urge for something taut, dark and pointed. So where else would you turn.
From the Blurb:
When Mitchell is released from prison after serving three years for a vicious attack he doesn't even remember, Billy Norton is there to pick him up. But Norton works for Tommy Logan, a ruthless loan shark lowlife with plans Mitchell wants nothing to do with.
Attempting to stay out of Logan's way, he finds work at the Holland Park mansion of faded movie actress, Lillian Palmer, where he has to deal with her mysterious butler, Jordan.
It isn't long before Mitchell's violent past catches up with him and people start getting hurt. When his disturbed sister Briony is threatened, Mitchell is forced to act.