The discovery of a ringing mobile phone seems the least on Sam's mind after witnessing a horrific car accident - but the voice on the other end of the line unveils a kidnap and ransom plot to turn his world upside-down.

Sam Pinkett and Phil Bourne, office workers for Berkshire County Council, have their menial existence turned upside-down by a chance phonecall and a case of mistaken identity.

After being sole witness to a car crash on a desolate country road, Sam answers an abandoned mobile telephone and hears a message that was clearly not meant for him: "If you are not here by 5 o'clock, we will kill your wife".

Encouraged by Phil, the office mailroom delivery boy, that they can be the heroes of the hour, the pair soon find themselves plunged into a deadly kidnap situation.

Sam and Phil soon find they're dodging bullets and escaping explosions in their quest to save not just themselves, but their loved ones and ultimately their whole town.