If you love the Indiana Jones movies, you won't want to miss “Father and Son,” an optional objective hidden in Great Circleand Vatican City. It requires you to go a bit out of your way, but you'll be rewarded with a special Adventure Book, a couple of Field Notes, and a little feedback to the third. Indiana Jones movie, the Last Crusade.
To find “Father and Son” at all, you must complete the fieldwork mission “A Nun in Trouble.” You will automatically start this after your first meeting with Gina. The quest requires you to enter the Vatican City museum through the Blackshirts campsite, then rescue Gina's friend Giuliana from the top of the Borgia Tower.
As part of your reward for completing “A Nun in Trouble,” you'll receive Giuliana's key, which also begins the “Father and Son” Mystery mission. As Giuliana tells you, this opens a nearby door in the Borgia Tower, as shown on your in-game map below.
At first, it looks like it might just be a shortcut, since the door leads to a balcony with a zipline that you can use to get back to the street. You'll land right outside the Confession Fountain, ready to continue the main story.
However, there is a second locked door near the zipline that contains the real secret. Open it with Giuliana's Key to find a storage room where you'll find a sleeping dog, a lazy cat, a locked safe, a Band, and piles of disorganized documents. One of those documents is a new Adventure Book that teaches the Throttle skill, which allows you to launch stealth takedowns at range with Indy's whip.
To solve this mystery, you need to get into the safe. First, open the drawer in the table in the middle of the room to find the Italian Poem. The poem is irrelevant, but someone has circled eight of its letters: I, R, I, A, T, A, S, O.
Second, open the drawer under the nearby typewriter to find a second document, the Polybius Square Diagram. This provides a cipher for the letters from the Italian Poem, although that doesn't see much use in video games.
In practice, the main obstacle to “Father and Son” comes from the cursed writing on the Poem. It's easy to mistake the final “O” for an “A,” which throws off the entire code.
When run through the Diagram, the circled letters become a four-digit code:
I + R = 5
I + A = 8
T+A = 7
S + O = 3
The code is for the safe 5873.
Open it to find a Siwa Picture, Junior Report, Office Picture, and Senior Report. This gives you 60 Adventure Points for finding the 4 notes, and another 100 for completing “Father and Son.”
Indiana Jones and the Great Circle available now for Xbox Series X/S, Xbox Game Pass, and PC via Steam.
