Secrets of the Past
Secrets of the Past is a level in the Blood Ties story set in Croft Manor, part of the Rise of the Tomb Raider: 20 Year Celebration. It starts shortly after leaving the Wine Cellar and just as Lara enters the Library.
Lara has to find the combination to the safe that is hidden somewhere in the manor. In order to do so she has to first collect a sheet of paper, the Safe Combination Clue, a list which includes Lara's First Find, Lord Croft's favourite panting by Amelia - which supposedly can be found in the Atelier -, and their wedding anniversary - which is located in the Master Bedroom.
Nearby she can find the Old Lighter which can be used to light fireplaces.
In order to reach the top of the bookshelf Lara has to first move the ladder, go up, move the boxes up there, and then again move the ladder to it's original position. Upstairs she finds the Expedition Map called Lara's Childhood.
Finally, Lara leaves the Library to investigate the West Wing, a part of the manor she was forbidden to enter by her father when she was a child.