San Diego PI Madison Kelly arrives home to a note stabbed to her front door: "Stop investigating me, or I will hunt you down and kill you." The only problem? Madison hasn't been investigating anyone. The only way to remove the threat is to do exactly what "Anonymous", the note writer, is telling her not to do: investigate to see who left it. Madison has been tweeting about a true crime podcast about girls who went missing, two years apart, after a night at the clubs in San Diego's famed Gaslamp Quarter. Are the girls dead or did they just walk away from their lives? And who is Anonymous, the person who will stop at nothing to keep Madison from learning the truth? -- adapted from jacket