"Guy talked about that all the time and said, 'What if the fountain of youth was inside you? What if it's just a metaphor for the light inside you that you can either make brighter or dimmer? And what if you worked really hard to pull out all the things that made you joyful,

Krasinski's an adventurer named Luke Purdue, hired by the billionaire Owen Carver (Domhnall Gleeson) to find the mythical fountain. Owen's dying of liver cancer, you see, and would love to take just one little sip.