On her way home from studying for college finals, hardworking Ashley Mercer is attacked and killed outside her apartment complex.

Thirteen witnesses to the murder do nothing to save her. Days later, one of the witnesses is found dead Detectives Alex Mercer and Samantha Stoll search for the truth behind the witness's death.

However, Alex is Ashley's brother, and his personal struggles may jeopardize the investigation, while Samantha's own demons plague her.

As the body count rises, the detectives travel down a path of violence and betrayal, leading them to a killer who will spare no one.