Guns in the Night — J.T. Edson

THE FINAL FLOATING OUTFIT BOOK. Belle Starr, lady outlaw, had been murdered, cut down from behind by a double charge of buckshot. Nobody knew who had killed her.But Dusty Fog, Mark Counter and the Ysabel Kid swore they would bring in the murderer.Getting whoever killed Belle meant a lot to the three Texans.It meant more than ever to Mark, for he had planned to ask the girl to be his wife.