Seventeen-year-old Y/N Porras lives what looks like a normal high school life at Crestwood Heights—friends, family, routine. But something feels wrong. Anonymous messages begin to appear, each one disturbingly personal, as if someone is watching her every move. As tensions rise between her protective twin brother, her lifelong best friend, and the people slowly entering her orbit, Y/N realizes she may not be imagining things. Someone has been following her for longer than she knows—and they’re not planning to stop.