Natalie Greco loves being a law professor, even though she can't keep her students from cruising sex.com during class. When a colleague talks Nat into teaching a class at a local prison, her comfortable world turns upside. A violent prison riot breaks out, and in the chaos, Nat rushes to help an injured guard. Before he dies, he asks her to deliver a cryptic message. The dying declaration plunges Nat into a nightmare. Suddenly, the girl who has always followed the law finds herself suspected of a brutal murder. Forced into hiding, she sets out to save herself by deciphering the puzzle behind the dead guard's last words.