After his girlfriend, Julie, and two best friends are killed in a tragic auto accident, Nick struggles to cope with his loss and grief. Suffering from migraine-like seizures, Nick soon discovers that he has the power to change the past via his memories. However, his time-traveling attempts to alter the past and save his one true love have unexpected and dire consequences.

High school senior Wendy's premonition of a deadly rollercoaster ride saves her life and a lucky few, but not from death itself — which seeks out those who escaped their fate.