This route follows nearby it's namesake feature- the north Ridge of the First Flatironette. The funny thing is though, that the further south away from it you go, the better the climbing is!
The rock on the N. Ridge itself is not as nice as the prime East Face, there is more dirt, less gear, and more trenches and trees to work around. Huh... no thanks.
Almost anywhere on this flatiron is a better place to climb.
Does the First Flatironette even have a North Ridge? Seems to me it runs into the Spy. Is this supposed to be the South Ridge? This "North Ridge" route is also in Rossiter but I have never understood what he refers to either.
The North Ridge of the First Flatiron and the Spy are separated by a dirty gully. It was easy for me to pick the two out from above, after which I down-soloed the N. Ridge. From below, the spy starts much further up the hill, so starting on the North end of the East face and climbing up and right should put you right on this same feature and if you don't cross a gully to the right, you'll stay on it.
I got this note from Richard Rossiter:"That description (now that I have looked it up) is for the SOUTH RIDGE. "Apparently, for the N. Ridge, follow my description, and for the S. Ridge, follow what is written in the book.