The Edge of Love is a 2008 British biographical romantic drama film directed by John Maybury and stars Keira Knightley, Sienna Miller, Cillian Murphy, and Matthew Rhys. The screenplay was written by Knightley's mother, Sharman Macdonald. The plot revolves around Welsh poet Dylan Thomas, his wife Caitlin, and their friends, the Killicks, while they navigate love, friendship, and wartime challenges in London.