After the Daltons latest escape, Joe vows to avoid being brought back by Lucky Luke by moving to Canada under the aliases Frank, Louis, Robert and Jim 'Imbecile' Jones. Their trail of crimes is easily followed anyhow, and over the border Lucky, having no jurisdiction, teams up with Mounties corporal Winston Pendergast, who has reports of their first crime in Canada. The chase proves long and eventful.
—KGF Vissers