Crouch-walk to the outside of the cave. After climbing up, you'll find the door ahead is locked, so let's turn back and take out the enemies behind us first.
After defeating the enemies, pick up the book in front: [Righteous Alliance Miscellany #8: Roll of the Fallen]. (A helpful commenter mentioned there's also an item in the red bushes to the left of the enemy, but it wasn't there when I recorded. Feel free to search around!)
