Good news? Gertrude was safely secured in the dungeons.
The bad news? Dahlia Elrod was not her cellmate. In fact, she wasn't in the dungeons at all.
Somehow, Dahlia had managed to evade capture, despite the hordes of werewolves sent out to track her down. According to Milo who was the closest to catching her, Dahlia seemed to dive into the sewers as she transformed into a human, and somehow her scent vanished and the trail went cold.
It was as though Dahlia had simply vanished from existence. Even when Milo took a torchlight and several other werewolves down to the sewers to search for her, they found nothing more than a few new gashes in the sewer tunnels, and a lot more bottles of scent blockers tucked in a corner in a wet moldy box.
With that, Thorton Elrod was also placed on house arrest, awaiting interrogation. We couldn't completely rule out his involvement in whatever Dahlia was planning.