Keira Knightley has been cast in the sci-fi thriller Never Let Me Go for Fox Searchlight, Variety is reporting. Mark Romanek (One Hour Photo) will direct the cloning-themed pic, which will also star Andrew Garfield and Carey Mulligan. The plot centers around a trio who grow up at a boarding school with no contact or knowledge of the outside world until they discover they're clones grown for the sole purpose of organ donation. Sounds like a cross between The Island, 1992's The Harvest and The Village. So, err... Island Village Harvest, anyone?