Three years ago, Ada made a mistake she thought she had left behind forever. Now, just as she is finally preparing to begin university, an unknown number sends her a chilling message: “I know what you did three years ago.” At first, Ada thinks it is only a cruel prank. But when the messages continue—and the sender reveals things only a few people could possibly know—she realizes someone has been watching. Then Femi, the one person who knows about her past, suddenly reappears. An old photograph. A forgotten secret. A mysterious stranger. The more Ada searches for answers, the more she realizes that the past she thought she had buried may have never been buried at all. Because some secrets don't stay hidden forever.