One of the things you need to do in Vampire The Masquerade Swansong Is to find the solution to the book puzzle and to put the swans in the right positions. To do it faster follow the given instructions in this guide and you will solve this without having any trouble.
Vampire The Masquerade Swansong: Red Salon Swan & Book Puzzle Guide
Exit the Red Salon and enter the first door on your left.
Once you’re inside have a quick look at the computer and observe the writing.
Go back to the first office, you need to pull the yellow book from the shelf so you can open the hidden safe. You need to pull them in this order: V, III and IV.
And to open the hidden safe put the Swans in positions like it’s shown below.