You're free to search the Mountain Village. As you may have noticed, it's a very wide location with a lot of collectibles to find. It would be a good idea to look for them now, but don't get discouraged by the fact that some areas will become accessible only further on. To advance the plot, head north-west, towards the buildings.
Turn north and go through the building that stands between you and your objective. There are several ways to do it; the easiest is to scramble up the wall, pictured above.
Continue moving north until you reach the foot of a cliff. Your next task would be to make your way all the way to the top; start by scrambling up the wreckage of the plane, pictured on the left (left of the waterfall).
Turn left and start running forward, leaping over the river to reach the right side of the plane. Continue onwards until you can get out.
Use the nearby rocks and get to the top. Face the wreckage again; from where Lara stands, as pictured above, you can jump on its right side.
Walk along the right side; Lara's weight should eventually affect its position. Stop when you reach the end and leap up towards the interactive ledges you see on the above screenshot.
The final part of the ascent is much easier, just scramble up the ledges above. When you get to the top, move towards the entrance to a cave, wolves' tracks will lead you there.
Have Lara light the torch and start exploring the cave. There's no need to look around, you won't find anything of value. You're safe from wolves for now, too.
Your destination is pictured above. Approach Roth's pack to trigger a cut-scene illustrating its recovery (reward: 500 XP).