As soon as you get to Rome in Indiana Jones and the Great Circle, while still trying to infiltrate Castel Sant’Angelo and sneak into the Vatican, you will notice a locked fence door that requires a Blackshirt Key. You might be wondering how to get the key and whether it’s found around the same spot where you first came across a door that requires it. In this guide, we break down everything you need to know about when and where to find the Blackshirt Uniform and Blackshirt Key that comes with it, and how to use it. First off, it’s pointless to search for the key at Castel Sant’Angelo, because you will be able to find it only after you’ve reached the Vatican and have progressed to a certain point in the story when you meet Gina Lombardi. Once you get past a cutscene where you chat with Gina on a balcony at the Apostolic Palace overlooking Saint Peter’s dome as an airship arrives, you can proceed to grab the uniform. The Blackshirt Uniform is in a courtyard just below the balcony of the nuns’ chapel in the Apos