Will Proudfoot (Bill Milner) is the ten-year-old son of a fatherless Plymouth Brethren family. The Brethren regard themselves as God's 'chosen ones' and their strict moral code means that Will has never mixed with the other 'worldlies', listened to music or watched television. Then he meets Lee Carter (Will Poulter), school terror and budding auteur. Lee exposes Will to a pirate copy of 'Rambo: First Blood' and, from that moment, Will's world is changed forever. When Lee tells Will that he wants to make a home movie version of the violent action film for an upcoming amateur film competition, the newly rebellious Will jumps at the chance to be actor and stuntman. As the summer rolls on the two boys set out to create the ultimate no-budget blockbuster, but their grand vision is threatened when Didier Revol (Jules Sitruk), the leader of a group of French exchange students, attempts to hijack proceedings...