Grandpa Rupert is a kind-hearted, old-fashioned white grandpa who moves with his family into one of the most dangerous neighborhoods in the city, hoping to spend his final days surrounded by the people he loves. But after accidentally taking a mysterious batch of pills, Rupert discovers they've given him extraordinary, otherworldly powers.

What Rupert doesn't realize is that the pills come with a price. Their creators—and dangerous people who want them—are now watching Rupert and his family, waiting to see what the old man can do. As Rupert's strange new abilities turn him into an unlikely neighborhood hero, his family is pulled deeper into a world of criminals, conspiracies, and people who will do anything to get the pills back.

Completely unaware of how powerful or valuable he's become, Rupert just wants to help his neighbors, protect his family, and enjoy whatever time he has left. Unfortunately, everyone else has very different plans for him.