The Circle of Cavan is an ancient group founded by Ioseph Cavan, who attempted to kill Lincoln but was thwarted when Gillian Gallagher stole his sword and killed him: the sword that is on display at the Gallagher Academy. Cammie realized who they were when she saw that one of the members wore a ring that had a symbol that also appeared on Gilly's sword. They intend to try and kidnap Cammie for reasons unknown. The Circle of Cavan is introduced in DJGC, when they give Macey misleading instructions and lock her on the rooftop with Cammie and Preston, the potential president's son, so they could kidnap Cammie. In most of DJGC, it is believed Macey/Preston was the object of the kidnapper's interest. Nobody really knows why they are trying to kidnap Cammie.