The young police lieutenant was a week away from going to the FBI Academy. During a routine call to Fox Creek Stables, her partner and mentor, Corbin, was decapitated by the Headless Horseman and Abbie saw the mutant for the first time. She met a time traveler Ichabod Crane and partnered with him to vanquish the Headless Horseman and prevent the End of Days.
After their father deserted and their mother’s seeming breakdown, Jenny and her sister Abbie were raised in foster care. While in high school, the sisters saw four white trees and the evil creature Moloch in the woods. While Abbie kept mum, Jenny was adamant about telling the cops what she saw. The authorities thought Jenny was delusional. A rift developed between the siblings and Jenny resented that she spent her life in and out of institutions while Abbie went on to have a successful career. The sibs reconciled and Jenny is a tremendous asset to Team Witness.
When the girls went to the woods to secretly drink beer, they saw four strange white trees and the demon Moloch. Though it only seemed like a few minutes, the girls passed out for four days and had a lot of explaining to do.
The Mills sisters’ mom was just misunderstood. Pushed to suicide she was battling literal demons.
Grace worked at Fredericks Manor, a sanctuary for freed slaves. It was discovered that Grace was one of Abbie’s ancestors.