JAKE BOUCHARD, a shy 17 year old, has finally scored a date with the incredibly wonderful ANGIE. There's only one problem: he's forgotten that his senile, paranoid GRANDPA is coming from the 'home' that night for his monthly family dinner, and it's Jake's turn to drive Grandpa back afterwards. Jake does some quick talking and manages to push off the date with Angie until after dinner, however while driving Grandpa back Jake gets a call. Angle's car has broken down and she needs Jake to pick her up right away. Though mortified at the thought of Grandpa bringing the crazy in front of Angie (he has all these nutty stories from World War 2) Jake has no choice but to go to her. Jake gets to the location, however Angie's gone. Jake assumes that Angie got a ride with someone else, however Grandpa sees tire tracks in the street and tells Jake that the tracks are military. "Your girlfriend is in trouble." Thus begins an insane night of chasing down clues that, on the surface appear insane, but the deeper Jake digs the more possible it seems that Grandpa is exactly what he's always claimed to have been; the greatest military intelligence officer of World War 2. Which means that Angie really IS in trouble! In a final effort to rescue Angie, Grandpa brings Jake with him as he reenlists "The Devil's Scum", Grandpa's old unit. Now octogenarians, the old soldiers band together with Jake to go on one last mission.