Web of the Spider Cult (Ubiquity)

from the publisher webpage:

When you find a dead body in your house, especially one which belongs to a notable explorer, you know it’s not going to be an ordinary day. Web of the Spider Cult takes the heroes from the corridors and galleries of the Boston Museum, to the bayou of Louisiana, and onto the dark jungles of Mexico. There, amid the ruins of a centuries old temple, the adventurers face their greatest enemy so far in the adventures.