A mysterious female voice on the phone forces a layabout (Shia LaBeouf) and then a single mother (Michelle Monaghan) into a series of bizarre, life-threatening situations in this explosive thriller.

Two appealing stars, virtually non-stop exciting action and state-of-the-art effects smarten up a preposterous tale that climaxes in a plot to kill the US President. Michael Chiklis and Billy Bob Thornton add class as the Defense Secretary and chief CIA man.