When people begin disappearing without warning, independent researcher Claire Mercer and her young protégé, Tessa, investigate a growing series of impossible eyewitness accounts.
From an apartment hallway to a crowded transit center and a college football stadium, ordinary places become scenes of extraordinary terror. But when Claire herself vanishes, the mystery becomes devastatingly personal. Her closest friend Martha struggles with the uncertainty of her disappearance, while Tessa continues the investigation as the phenomenon escalates into a national crisis.
With no clear explanation, no identifiable threat, and no way to predict who might disappear next, the survivors must confront a frightening possibility: the world they have always trusted may never have been safe.