Area in corner of spike pit room Find the area in the corner of the spike pit room. Climb up on the small block. Look up to see a high switch. Use a long running jump with grab to get to the lever. Release the rest of the keys, but keep holding down the grab or Action key to hold onto the lever and Lara's body weight will pull the lever down.
Animated scene follows.
The lever raised some gray blocks near the lever. Climb up on the blocks to a new area. Shoot the boards, and enter the alcove to pick up a small medi-pack. Now enter the library. Kind of a mess place with scrolls all over.