I'm going to be running my players and their characters through a long-term campaign set in the 1920s made up of a series of both pre-written and homemade one-shots.

I've already run "The Haunting," and so I'm setting up the Chapel of Contemplation to be reoccurring baddies, with them ultimately taking the place of the Brotherhood of the Beast when I run TFfY/DotB.

One thing I'd also like to do is set up New Worlds Incorporated in some one-shot scenarios before the PCs encounter them in TFfY/DotB. One reason why is because they will have an NPC who is a private detective who works cases for NWI, and he can be their "in" for when they go to the NWI mines in Peru.

I would also like them to encounter scenarios involving the Chapel of Contemplation to make them recurring antagonists for the PCs as well.

So I'm looking for suggestions for pre-written scenarios that involve cults that could be easily re-written to be the Chapel of Contemplation instead and also pre-written scenarios in which NWI could be involved just to establish them in the setting before TFfY/DotB is run.

Thank you very much for your suggestions, they are all greatly appreciated.