The Murder League — Robert L. Fish

They were the murder league, a group dedicated to committing any murder for anyone. For the small sum of one thousand pounds, the group would perform the killing for whatever the reason -- love, hate, money, fun. All the client had to do was drop a line in their post box and the deal was done. The murder league, three former mystery writers, performs their dispatches with a cool demeanor and the utmost dignity, with only their goal of ten heads on their minds. Soon the spice has returned to their lives, but that is until everything begins to go wrong.
 Join this lovable group of vigilantes as they spiral into a world where committing murder is never as easy as writing about it.