
Once you've cleared the fire trap, as shown in the previous section, turn right. The door ahead opens automatically. A thug with a gun and 2 more Dobermans (22-24) are waiting in the room below. You can kill them from the doorway if you like.
NOTE: If you're going for 100%, you may want to read ahead. The achievement/trophy "Moving Doesn't Change Who You Are" requires you to obtain the Library Key without moving the chandeliers. This isn't difficult to do, but it's easy to miss.

When the coast is clear, hop down into the BALLROOM and climb onto the first angled block.

Stand at the higher edge, jump straight up, and grab the chandelier above. Pull up.

Turn around and take a running jump to grab the middle chandelier; pull up.

Turn right and take a running jump onto the wooden ledge against the wall. Throw the switch...

...to open a secret compartment behind a painting on the opposite side of the room.

Do another running jump back to the middle chandelier.

Turn right and take a running jump to grab the highest chandelier; pull up.

Now you're aiming for the windowsill just above the secret compartment. Take a running jump in that direction and hold Action while in the air.

Lara won't grab the sill, but grabbing alters her trajectory so she lands on the windowsill.

Hang from the edge above the secret compartment. Let go. Then quickly press and hold Action again to grab the edge below.

Pull up into the alcove and take the LIBRARY KEY (12).

"Moving Doesn't Change Who You Are" should unlock, assuming you haven't already explored the room and rearranged the chandeliers.
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