Two closely-bound, emotionally wounded siblings reunite after years apart.
In Wyoming, mountain trapper Yancey goes to the nearest town to trade his pelts but gets into trouble when he tries to save runaway dance-hall girl Rosalie from her shameful job.
After a wave of reports of mysterious attacks involving people and pets being eaten by the traditionally docile fruit, a special government task force is set up to investigate the violent fruit and put a stop to their murderous spree.
