Late one night in a tragic twist of fate, Dan Peterson is murdered after witnessing a man leave an apartment complex. This serial killer feigns a heart attack and slashes Dan's throat when the Good Samaritan runs to help him. Dan dies a silent, gurgling death, but after a flash of light, Dan wakes up on a park bench next to a statue of Mark Twain. It is spring, and fifty-three-year-old Dan is young again. The only problem is that nobody can see him, and he cannot interact with any person in the park. In panic, Dan believes that he is dying in a hospital bed and his experience is the result of a drug-induced vision. Soon after, Dan meets Hannah, who also awoke from death on the Mark Twain bench. The murdered Hannah and Dan are solid and real to each other, but invisible to the outside world. At last, the two unconventional ghosts set out to find their killer and seek revenge. The first problem they must solve is to find a means of communicating with the police.