This guide shows how to solve the puzzle for Father and Son mystery sidequest in the Indiana Jones and the Great Circle game, which was released on December 9, 2024.
Father and Son Mystery Location
Progress through the fieldwork sidequest ‘A Nun in Trouble’, where you have to rescue NPC Giuliana and receive Giuliana’s Key from her for a room on top of the Borgia Tower.
Head into the room and open the table drawer. Interact with the note- Italian Poem inside the drawer to start the mystery sidequest. This Italian poem has certain letters circled.
Father and Son Mystery Walkthrough
Next, open the table drawer of another nearby table to find another note – Polybius Square Diagram. This diagram is a special grid that helps turn letters into numbers which you’ll need to solve the puzzle.
To solve the puzzle, You have to use the letters circled out in the Italian poem, and cross-reference with the Polybius Square Diagram to figure out the safe code in the Father and Son Mystery.
Circled Letters: i, r, i, a, t, a, s, a
I + R = 5
I + A = 8
T + A = 7
S + A = 3
The final code to unlock the safe in the Father and Son Mystery from Indiana Jones and The Great Circle is 5873.
