Purple Flame, The by Roy J. Snell (1878 - 1959)

Two years after the conclusion of "The Blue Envelope", Marian is crossing the frozen Alaskan tundra alone with three reindeer in order to greet her unknown cousin in Nome. Patsy has traveled from Kentucky. Kentucky! How will she adapt to a frigid winter in Alaska? Will the girls get along? Will the two girls manage the reindeer herd in Marian's father's absence? Who is following them? And just what is that purple flame in the old abandoned scow? (Summary by Lynne Thompson)