Start up the left-facing corner, moving to the right at the top of the corner after a fun lie-back move near the small black water-streak. Above the corner and to the right follow a crack/seam to the white headwall with brown patina plates and a ledge with a two-bolt rap station.
This starts in the obvious left-facing corner above and to the left of the big roof at the bottom of the west face of Siberia
Fixed pin mentioned in guidebook is gone. Crux move is a .7 or .8 lieback about 25 feet up. There is no gear for the first 35 feet. Blowing the crux would send you down a chasm below the start of the route, maybe a 40-foot fall with a bad landing.
This route and Glen's Crack can be toproped by traversing right and around a grainy corner from the anchor for Irish Toothache (which climbs right up the arete on the horizon at the left of the photo) to the two-bolt anchor on the ledge.
Toproping with a 60 meter rope will require some easy downclimbing unless you extend the anchor about five feet.
BETA PHOTO: Jack is the right line on this topo.