What's the Name of That Book??? discussion

This topic is about
The Rule of Four
SOLVED: Adult Fiction
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College student and friend try to solve puzzles in old book. [s]
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I had listened to it on audiobook and wanted to listen to it again, I found all of the historical references to be very interesting. Apparently a lot of people hated it... :)
Thank you, D, I really appreciate it!

I am going nuts trying to figure out what this book is named.
Long involved book where main character and his friend are in college. He has a book or codex that his dead father had puzzled over for years. Book contains many puzzles of classic or ancient origin that need to be solved. Goes into a lot of detail regarding individual clues they are researching, which gives a lot of history.
It turns out that one of their professors had known the father, possibly arranged his death. The book turns out to be the key to the storage place of a bunch of ancient treasures that were due to be destroyed by some ruler, possibly of the Church.
The climax of the story was where his friend appears to be killed in a fire on the campus, but then the main character gets a communication that shows the friend is still alive and that their puzzling over the mysteries had not been in vain.