In words of Knight himself, "Step up into Dirty Rat’s Crack and look up and right after about 10’ up the crack. Step up to a high clip out of the Dirty Rat’s Crack and make the first of two crux moves into the seam above. Work your way left through the maze as you clip two more bolts. Look for the big 'mouse hole' left of the 3rd bolt. ...reach high into big jugs as you move right. Crouch under the roof as you put in a cam. Work your feet up high and step up to place a gold Alien in the horizontal seam above the roof....pull the roof, clip the last bolt and...then chains."
Location
The line climbs above Dead Rat's and left of Crank You, Thank You