MacGregor, Ellen

The resourceful Miss Pickerell helps rescue her companions from the Arctic wastes of the Far North and makes a valuable contribution to scientific research.

Miss Pickerell decides to help her friend, Mr. Rugby, find out why his ocean farm is suddenly unproductive.

Miss Pickerell hears that her famous collection of rocks from Mars has gone down in a shipwreck. To search for the wreckage herself, she learns about deep-sea diving, atomic submarines, underwater television and sonar equipment.