Ok I read over the adventure again and I see that room 4 mentions Luna says her husband is trapped in room 11. It took me a minute to figure this out. At first I thought that Luna and her husband got into some kind of a fight with the werewolves and Kain was imprisoning Luna’s husband lol I was very confused, but I think I’ve finally got it now:
Luna ebert and her husband kain are all werewolves and they’ve ransacked and tried to takeover this temple in hopes of getting rid of their lycanthropy in the process while trying to figure out how to heal themselves they have also killed almost all three of the temple druids in some kind of a battle but the lycanthropes just nearly sort of won with Luna ending up chained up and kain being stuck in the well somehow. Ebert was out and about watching or something and I assume doesn’t know about his companions predicaments but they have essentially killed everyone there.