This is great! I'm glad your group enjoyed it!
I designed this as a sort of narrative hook with few landmarks along the way to drive the whole thing into an autonomous conclusion. So a lot of the credit goes to the DM, filling in or removing what does not work. Did you have to do much of the latter to do to make it work in your campaing?
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I had to do a bit of it. For instance, the party saw the warning letter hastily carved into a sign along the path they were travelling, and they found the church along the way. I don't mind having to get a bit creative about things. Sometimes it's better when everything isn't exactly spelled out and defined to the letter.