Owl Pen Book is certainly off the beaten path: It's behind a house on a gravel road a mile past fallow farmland. (Chris Berger) Book Smart: Greenwich’s Seasonal Owl Pen Books Is Keeping The Printed Page Alive The shop, co-owned by a former Skidmore professor, has an estimated 100,000 secondhand volumes in its stacks. This can’t be the right way,” I say to myself as I turn onto a…