Climb the right arete on the first "domino" that fell off of the back wall.  Start sitting under the boulder on the slab behind it and stay under the boulder the whole way, reaching around the edge and heel hooking your way up.  Reach the thin top of the boulder and match to finish - there's nowhere to top out to.

The far right side of the first "domino" that fell off of the back wall - the back of the route directly faces the back wall.

A slab follows up behind you most of the way, so you can step back when you fall.