Prologue (Read first)

Another day, another case, with Cassius and Kestrel Glade; The lovely Crime Scene Analysis, and Psychologist. After receiving a call from their good friend, Daniels, they've received another case offer: A 72-year-old man has suddenly disappeared under the viewing of his neighbor. Now it's up to Kestrel to figure out what really went wrong.
Has the victim died due to human nature, or does this case dwell deeper than both detectives could have ever forseen?