Masks of Nyarlathotep is one of the most intense and longest lasting campaigns ever made, also generally rated incredibly highly by people who have played it. I think
Here are some additional resources to improve the new York portion of your Masks of Nyarlathotep campaign. Over on Mental Floss, there is an interesting article on pre-World
Masks of Nyarlathotep begins in earnest in New York City. Friend of player characters and occult journalist Jackson Elias sends the players a telegram which brings them together
In Masks of Nyarlathotep London is the TRUE beginning of your campaign. While things do kick off in New York with the (spoilers) murder of Jackson Elias, London
I had planned a long article that covered the History of Masks of Nyarlathotep, but then I found this article on the Escapist. It covers the game, it’s creation
Masks of Nyarlathotep Conversion: d20 System Like many of the articles here, I must instead point you to the folks at Yog-Sothoth.com, who’ve already done the grunt work