One of the payroll robbers got a knife slash on his saddle. Red tells the saddler to tip him off if he notice anything like it.; The killer, Pronto Tull and his gang busted out of jail two days earlier and are supposed to be on their way to Rimrock. As Little Beaver and Po-ko head for home, they run into the gang in uncle Neb's cabin.; Red Ryder and Little Beaver trail the rustlers to a railroad tunnel.; Mr. Flaxter has invented a gold-finding machine, but Auntie is mighty suspicious, and rightly so.