Sixteen year old math whiz, Autumn, spends her days reading about serial killers and dreaming of becoming an FBI Profiler. She never dreams her first case will be so personal. Her world is shattered when she comes home from school and discovers her murdered sister's body on the living room floor. When the initial evidence points to a burglary gone wrong, Autumn challenges the police's theory because of the personal nature of the crime. Thinking that finding the killer will bring her family back together, she conducts her own investigation using her affinity for math and forensics, but her plan backfires and her obsession with the case further splinters her family. When her investigation reveals the killer is someone she knows, Autumn offers herself up as bait and sets a dangerous trap to unmask his true nature and to obtain a confession for her sister's murder.