A woman’s life spirals out of control as she lives in fear of a faceless predator who may have already committed at least one murder . . .

Ten years ago, Sophie Shaw vanished. Kat, a DNA technician with a drinking problem, is still haunted by the unsolved disappearance, so when she notices a suspicious tweet online, she calls in a tip to the police. When Kat learns that a man is being questioned, she sends out a tweet of her own, boasting about her role in the development.

But when the man is released, Kat starts to receive abusive messages online, and becomes the focus of an angry exchange with the anonymous man she believes is the guilty person. Having failed to hide her real identity, Kat becomes paranoid about every man she encounters, and her life beings to fall apart.

Is someone really out to destroy her or is she destroying herself?