This is a short (by First flatiron standards) 3-4 pitch route on the Southern side of the East face of the First.
The quality of the rock is good although pro is not that easy to find.
The route starts some 200 feet above (South) the start of Baker's Way. The start can be reached by staying on the trail between the First and the Second and looking for the next "easy" way to get on the face after Baker's Way.
Look for and easy, broken groove that heads North East for some 30 feet.
Climb the groove to a small ledge and head up a small dihedral with a small East facing ramp leading to a short steep face (Crux). Roach mentions the existence of an old piton after the crux, but we either missed it or it was gone when we did the route.
After the crux, you can either continue up the dihedral to a tree and then the North arete, or you can move left onto the East face of the false summit. The latter option provides a cool but relatively unprotected face climb.
From the North Arete, take a left and reach the summit in one pitch or less.
Descent - rap down or down climb the South West face.
The piton is still there, look carefully about 15 feet ABOVE the crux. It looks like someone bent it over with a hammer, you couldn't clip a biner into it. You could sling it with a runner, though.