The Haleman Limit
Ben Hayflick

Keith is a struggling filmmaker whose career is fast approaching its expiration date. One day he learns of a distant reclusive uncle named Leonard, and Keith resolves to make him the subject of a last-ditch documentary. But when he uncovers his uncle is a noted gerontologist who may hold secrets to extending the human lifespan, the story-and the truth-become more dangerous than Keith could have imagined.