The idyllic University of Idaho campus in the small college town of Moscow, Idaho, is shattered when four popular college students, Ethan, Kaylee, Maddie and Xana, are found murdered in an off-campus house.

The police department's initial refusal to give information doesn't help quell the rising tide of terror, and many students flee campus; social media sleuths fuel speculation and rumors; the police admit that there's an ongoing threat.

In a shocking turn of events, seven weeks after the murders, a suspect is arrested, a complete stranger to the victims' friends and families; the arrest sends shockwaves through the community, as questions arise about him and his motive.

A detailed account of what happened the night of the murders is revealed, including details from the eyewitness; a potential motive emerges, as the delayed trial looms in the distance.