When Katie Lee Biegel first encountered the nonfiction book about Windows on the World that would inspire the CNN documentary short Top of the World, she was still co-hosting Food Network‘s The Kitchen, which came to an end last year after its 40-season run. Chef Marc Murphy, who had worked at the restaurant atop the World Trade Center, gave Biegel and her co-hosts copies of Tom Roston’s The Most Spectacular Restaurant in the World when he was a guest on the culinary talk show hosted by Biegel, Sunny Anderson, Alex Guarnaschelli, Jeff Mauro and Geoffrey Zakarian. “I started reading it in my dressing room between segments, and I was like,…