The Outdoor Girls at Foaming Falls; or, Robina of Red Kennels

Mollie Billette is appointed as the new leader of the Outdoor Girls, replacing Betty Nelson, who has now married Allen Washburn. The girls purchase a dog for Betty's upcoming birthday and throw her a surprise party. The party is a great success, and Betty adores her new dog, Wags.

The very next day disaster strikes as both Wags and Irene's dog, Hesper, are stolen! Other residents of Deepdale soon report that they, too, are missing their pets, and no clues to the whereabouts of the missing dogs can be found.