Ruth Fielding and the Gypsies or The Missing Pearl Necklace (1915)-
An automobile trip, kidnapper Gypsies, a stolen necklace, and a reward -- and Ruth must find a way to escape her pinch-penny Uncle.
Ruth Fielding on Cliff Island Or, The Old Hunter's Treasure Box (1915)-
Ruth's classmate Jerry is hurt in a train wreck and goes to convalesce at the Red Mill. While tended to by Aunt Alvirah and Ruth, Jerry reveals how his uncle was cheated of his land on Cliff Island after losing his treasure box and deed in a landslide.
Ruth Fielding in Moving Pictures or Helping the Dormitory Fund (1916)-
Ruth, Helen, and Tom watch a movie crew film scenes near the Red Mill. As they watch, the starring actress, Hazel Gray, falls into the river and is swept downstream. Ruth and her friends rescue the actress and take her to the Red Mill to recover. The next day, Ruth meets the producer who promises to read Ruth's script when she impulsively confides that she is planning to write one.
Ruth Fielding Down East or The Hermit of Beach Plum Point (1920)-
Ruth, already successful as a scenario writer, had planned an unusual outline for a new moving picture. This outline disappeared and then turned up in a most unexpected fashion!
Betty Gordon at Mountain Camp (1922)-
At Mountain Camp Betty found herself in the midst of a mystery involving a girl whom she had previously met in Washington.
Betty Gordon in Washington (1920)-
In this volume Betty goes to the National Capitol to find her uncle and has several unusual adventures.
Betty Gordon in the Land of Oil (1920)-
From Washington the scene is shifted to the great oil fields of our country. A splendid picture of the oil field operations of today.
