Book excerpt: Can a long-forgotten memory of a horrible event suddenly resurface years later? How can we know whether a memory is true or false? Seven spellbinding cases shed light on why it is rare for a reclaimed memory to be wholly false. Here are unforgettable true stories of what happens when people remember what they've tried to forget -- plus one case of genuine false memory. In the best detective-story fashion, using her insights as a psychiatrist and the latest research on the mind and the brain, Lenore Terr helps us separate truth from fiction.