A teacher at a struggling school is devastated by the death of her star pupil at the hands of a criminal ex-boyfriend. She accidentally avenges the murder and quickly finds herself in the gray area of vigilantism, and surrounded by the challenges of today's youth.

A deadly airborne virus finds its way into the USA and starts killing off people at an epidemic rate. Col. Sam Daniels' job is to stop the virus spreading from a small town, which must be quarantined, and to prevent an over reaction by the White House.