Indiana Jones and the Great Circle's first major DLC has arrived. With The Order Of Giants comes a new adventure for Indy to go out on and of course it comes with it new collectibles, puzzles, achievements and more! But don't worry we have you covered with everything you need. This guide will help you solve the “A Collegial Mystery” Mystery within The Order Of Giants.
Where to Start
A Collegial Mystery is probably the easiest missed mystery in The Order Of The Giants DLC as it actually takes place before you even get to Rome. In order to start the quest, you will have to find a note in the Casina Pio IV building located right at the beginning of the DLC.
Upon entering the Casina Pio you will come across a large map on the wall. This is where you would go to start the trek to Rome and begin the main part of The Order Of The Giants. However, before you solve this map look to the right of it to find a staircase you can head up.

At the top of the stairs, you will enter a room which is connected to a much larger room on the right. Enter the large room and look to your left to find Federico’s Letter on a desk. Picking this letter up will start the Collegial Mystery which requires you to open a safe.

How To Solve
If you simply want the code without putting in the work you can scroll to the bottom of this article and head straight to the safe in the corner of the room.
To actually do the steps, start by heading to the row of chairs where you will find a note under one of them. This is Alessandro's Letter and will contain the clues requires to unlock the safe. The clues are:
- Consider the number of Apostles when our Lord washed their feet
- Reflect upon the multitude of Cherubim bearing witness to the Nativity of our Savior
- Finally, carefully count the number of beasts present in celebration as the prodigal son returns to his father’s embrace

These clues reference to the pictures hung on the wall of the Apostles, Cherubim and Beasts. There are 12 Apostles in the first image, 2 Cherubim's in the second and 2 Beasts in the last picture.
This gives us a safe code of 1222. You may now head over to the safe and unlock it with that code completing the mystery and finding 1 of the 2 adventure books in the DLC, Hard Crust as well as a note.

And that’s all there is to this mystery side quest. You will need to complete this and all the others in order to complete the DLC achievements/trophies and you are well on your way now.
More The Order Of Giants Guides
- Serpent Puzzle Solution
- Pet The Cat Achievement/Trophy
- Depths of the City Achievement/Trophy
- The Seven Grades Achievement/Trophy
- How to Return To Rome
- A Tale Of Wine Making Mystery
- A Bull in the Sky Walkthrough
- Gladiator Puzzle Walkthrough
- Tomb of Gibborim Puzzle Walkthrough
- Monster's Gate Puzzle Walkthrough
- Books of Power Achievement/Trophy