Ed Turner has arrived at his fiftieth high-school reunion for the class of '68, only to learn that everyone there thinks he died fifty years ago. Surely, there's been a mix-up. But Ed soon comes to believe that he's either delusional or entered an alternate reality, where another version of him did die at age eighteen. As Ed becomes increasingly desperate to find a way out of this mind-bending nightmare, he is aided by a quirky high-school student...