Lock Every Door is the third thriller from Riley Sager, the pseudonym of an author who lives in Princeton, New Jersey. Riley's first novel, Final Girls, was a national and international bestseller that has been published in more than two dozen countries, won the ITW Thriller Award for Best Hardcover Novel, and is currently being developed into a feature film by Universal Pictures. Sager's second novel, The Last Time I Lied, was a New York Times bestseller.
