When Ed Wallis starts at a new school in a new town, his classmates quickly assume that he's a loser even though he's the smartest and funniest guy in class. His first assignment is to write an essay about someone from an older generation, so he turns to his reclusive next door neighbor, Ashby, who agrees to help as long as Ed promises to drive him around town when he has errands to run. What Ed doesn't know is that Ashby is a retired CIA assassin who only has months to live. What's more, Ashby has discovered that his former handlers tricked him into killing an innocent man some years earlier and he intends to assassinate his old superiors before he dies as a way of atoning for this illegitimate killing. Ed unwittingly acts as getaway driver for Ashby as he tracks down and eliminates his old colleagues with terrifying skill and precision. In the process they form a close and endearing bond, cemented by a shared sense of humor.