Doc Fawcett hires Mike to find the person to whom he's paying protection money. He's received letters that threaten his daughter, a high-wire acrobat, will suffer a serious, if not fatal, accident unless $500 is paid every month. When the leading suspect, Lou Lindsay, is shot with Doc's gun, Mike has no shortage of suspects - Doc hated the man because he made unwanted advances towards his daughter; the girl's would-be boyfriend had been severely beaten by the roughneck, Lou had made loved than dumped have the women in Doc's carnival and the cuckolded husband of one of the women ran the carnival's shooting gallery.