Annabelle Collins' world is devastated when her 6-year-old daughter dies in a Missouri school shooting.

The shooter is the first of its kind - a black female.

16-year-old Raven Monroe.

Annabelle's grief mutates into an obsessive relationship with Raven, who dwells behind bars, unremorseful.

Desperate to find out why Raven did what she did, Annabelle races against the executioner's clock until finally the horrific motive behind the murders is revealed.