The Cerberus Society is a group of main characters from various series that all have one thing in common: they (or their group of friends) know of parallel worlds, other dimensions, or hidden worlds and must keep them from the knowledge of the general public.
The Cerberus Society was founded by cousins Ashtree Waxwing and Snowstream Harper. As both girls hail from the small town of Stillwater, it is sometimes jokingly referred to as the "Stillwater Secret-Keepers", which is also the title of the fanfiction series it appears in.
Mitakuye Oyasin, or "we are all related" in Lakota, is both the motto and password of the Cerberus Society. It is more loosely translated at times as "we are one".
- The name comes from the fact that most if not all of the members have some relation to canine creatures, and that they stand as "guard dogs" of their respective secrets.
- There is also a "Cerberus Society" in The Dogs of Babel by Carolyn Parkhurst. Cutler had forgotten about that, until she looked the book up for the Tam Lin quote.