It is early in the days of radio, and amateurs are using it more and more, and using it illegally. Enter Curlie Carson, who has the job of tracking down the miscreants. Sounds boring. You wouldn't expect high speed car chases, kidnapping, double dealing, and maybe even murder.

Rosemary Sample, an airplane stewardess, meets a mysterious dark lady on a flight to Salt Lake City. The plane is forced down overnight by a snowstorm. The passengers spend the night in a Hunting Lodge. In the morning, the dark lady finds her bag missing. It contains important papers that may mean the life or death of thousands of people in the small town of Happy Vale. - Summary by Dawn Larsen

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?

Student Lucile Tucker works part-time at the library of the large university she attends in Chicago to help pay her tuition. One night, while closing the library for the evening, she glimpses a small child – a girl – in the stacks. Carefully following her, Lucile can’t believe her eyes when the child, unaware that she has been seen, manages to steal a valuable book from the collection and practically disappear from the library right before Lucile’s eyes. This is only the beginning of her search for why this child took this book (and others)...

Curlie Carson and Joe Marion are chasing a radio outlaw across the frozen Alaska territory. It should be a simple dogsled trip, especially with hints from the mysterious “whisperer.” But wolves, blizzards, reindeer rustlers, and more say otherwise. Can the boys safely cross treacherous sea ice, capture the outlaw, and rescue a stranded arctic expedition? Maybe. Maybe not. Listen and find out. - Summary by Tom Penn