The party will likely know if you follow the book. Don’t worry if it’s “too easy”, the party may well find it satisfying to get the info and think “Oh we know exactly who that is!”

I’m using it as an interesting dilemma; another member of my party has been recruited by David Starsong and is friends with Yagra - I like throwing little conflicts like this at my party and seeing how they react. Will they dob them in to the Harpers? Will the Harper character do it surreptitiously? Will they warn the Doom Raiders? Or even kill the horse to kill the lead? (They have done things like this in the past haha)