What the Dead Know is a crime thriller by the American writer Laura Lippman, published in 2007. Set in Baltimore in 2005, the novel follows an investigation into a woman who claims to be Heather Bethany, a girl who disappeared thirty years prior. The book received critical acclaim and won the 2007 Quill Award in the mystery/suspense/thriller category, as well as the 2008 Anthony Award for Best Novel.