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, ‘Wow, this book is so captivating!’ And I couldn’t put it down,” Biegel recalls. “So I gave it to my husband [Somebody Feed Phil producer Ryan Biegel] when I finished it, and he was the same as me. He read it in like two days, and for a couple of years, we just kept saying to each other, ‘That should really be a documentary.’ And …