The It List: A Netflix documentary on a Korean sex abuse ring, David Letterman returns for another season of 'My Next Guest Needs No Introduction' and more pop culture picks for the week

This week on The It List: On Netflix, a new documentary, Cyber Hell: Exposing an Internet Horror, tells the story of an online sex abuse ring that used blackmail to coerce girls into posting sexually explicit content online. Also on Netflix, David Letterman returns with a fourth season of his acclaimed interview show My Next Guest Needs No Introduction. This season features interviews with Ryan Reynolds, Will Smith and more.

And finally, Downtown Abbey: A New Era brings the Crawley family back to the big screen with a plot that includes a wedding, visitors from Hollywood filming a movie, and a mysterious inherited villa in the south of France.