Fraternal twins Kyle and Peter accidentally discover they’ve been living with a lie all their lives. The kindly man in the photo on their mantle isn’t their father after all, but an invention their mother concocted to conceal the truth: that she actually doesn’t know who their real father is. See, it was the seventies, and things were crazy, and… well, you know. Armed with only a handful of clues, the brothers resolve to find the mystery man in what results in a road trip of discovery and revelations—about their mother, themselves and each other.