Synopsis by Hal Erickson
In the conclusion of a two-part story, Mary Ingalls (Melissa Sue Anderson) is in dire need of a life-saving operation. Lacking the necessary funds, Mary's father, Charles (Michael Landon), signs up for a high-paying -- and highly-dangerous -- new job. Working shoulder to shoulder with his neighbor Mr. Edwards (Victor French), Charles becomes a "powder monkey," part of a team blasting a tunnel for the railroad. Inevitably, disaster befalls Charles and Edwards in the form of a sudden cave-in.