The October Five (2010)

A Plumber, an Electrician, a Caretaker, a Locksmith, and a Butcher.
Why do they secretly meet in a room?
Veteran Detective Karl Whaler is thrown into an investigation that may be the strangest and most dangerous of his career, involving the brutal murder of a young man. The man is found strangled in his bed.
Unknown to him, five individuals frequently meet in a room. They have been meeting for decades.
During the course of the investigation another man is found murdered. This time the victim's throat has been slashed.
Is there a link between the two victims? Can Whaler solve the cases before there are any more murders?
THE OCTOBER FIVE is a spiraling page-turner that examines friendship, loyalty, and justice.