The Inner Life of Martin Frost is a 2007 American romantic-mystery drama film written and directed by Paul Auster and starring David Thewlis, Irène Jacob, and Michael Imperioli. The film is about an author who having just completed his fourth novel travels to his friends' vacant country house to spend a few weeks alone. There he meets a beautiful and mysterious woman who inspires him to write a new story. Filmed in Azenhas do Mar in Sintra, Portugal in the spring of 2006, The Inner Life of Martin Frost is Auster's fourth film as director and writer. The film premiered at the New Directors/New Films Festival on March 21, 2007, and was released in the United States on September 7, 2007.