Witness to Slaughter

Jack has coped through previous holidays, but this one feels different. It's been four years since he lost his family, and clues to finding those responsible have dried up. Hopelessness has him so tightly wound that he's often driven out of his claustrophobic apartment before the ever-present black dog of depression drags him to a place where there's no coming back from.
Jack wants to be left alone with his sorrow, but when he's offered double his fee by the wife of one of the city's most elite families, how can he refuse? She wants him to follow her husband, Franklin, as she suspects he's cheating and needs photos to get around the strict prenup. Franklin leads Jack across the city to The Majestic Lounge, the Castro District's most popular gay nightclub. By the time he finds Franklin, Jack is forced to break up a heated argument between him and club owner, Chad Lucas.
Lucas approaches Jack the following day, wanting to hire him for added security during the club's popular annual Drag Queen Extravaganza. The event's usual excitement is marred by the deaths of several of Lucas' friends that authorities are calling suicides. Lucas convinces Jack something more nefarious is going on and agrees to the job.
Does the city have another serial killer on its hands, one who's targeting the LGBTQ community? Can Jack find a witness? Surely in the crowded nightclub, someone must have seen something.