Indiana Jones and The Great Circle Father and Son Mystery Code: How to Solve

In Indiana Jones and the Great Circle, the Father and Son Mystery in the Vatican is one of the most intricate puzzles in the game. This guide will take you step-by-step through solving the mystery, from discovering the clues to unlocking the secrets hidden in the Borgia Tower.

Step 1: Prerequisite – Complete ‘A Nun in Trouble’

Before accessing the Father and Son Mystery, you must complete the A Nun in Trouble side quest given by Gina. Successfully finishing this quest rewards you with Guiliana’s Key, which opens a vital door in the Borgia Tower.

Step 2: Find the Vatican Agency Room

Using Guiliana’s Key, unlock the hidden room located halfway up the Borgia Tower. Inside, you’ll find essential items for solving the mystery:

• The Polybius Diagram
• An Italian Poem
• An Adventure Book

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The poem and diagram are crucial to cracking the safe’s code.

Step 3: Solve the Poem Puzzle

The Italian Poem in the desk drawer contains eight circled letters:
I, R, I, A, T, A, S, O.

How to decode it:

1. Pair the letters: IR, IA, TA, SO.
2. Refer to the Polybius Diagram to find the numbers corresponding to each pair by matching the grid’s rows and columns.
3. The result is the safe code: 5873.

Step 4: Unlock the Safe

Input 5873 into the safe. Inside, you’ll discover:

• Four Mystery Notes
• 160 Adventure Points
• A collection of covert photos of Indiana and his colleagues during their Vatican escapades.

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Bonus: Connect the Mystery to the Narrative

The Father and Son puzzle isn’t just about rewards—it deepens the story. The items found highlight the bond between Indiana and his father, exploring themes of family and legacy through historical and personal ties.