Consumed by greed, gold prospector Lin turns on his partner, Jonathan, in the hopes of securing a recent discovery for himself. Lin's plans go awry however when his duplicity and foul deeds are uncovered by young Tommy and Jonathan's faithful companion, Shep. Desperate, Lin recognizes the threat Tommy and Shep pose, and takes measures to have both share the same fate as Jonathan. This film, one of the darker and more suspenseful of Lassie's adventures will leave you glued to your television right to the very end!