The Rook is a supernatural spy drama – a genre particularly suited to be made by "naturally duplicitous" Brits, according to exec producer Stephen Garrett. Character Seven boss Garrett, who co-founded Broadchurch producer Kudos, also discussed the departure of Twilight author Stephenie Meyer from the Starz drama. The Rook tells the story of Myfanwy Thomas, played by Emma Greenwell, a woman who wakes up in the rain beside London's Millennium Bridge with no memory of who…