Paul Callaghan (1947 - 2012) was an internationally celebrated scientist, and a passionate advocate for Aotearoa. He was a popular science communicator (including a radio show with Kim Hill), campaigned to make New Zealand “a place where talent wants to live”, and championed the idea of a predator-free New Zealand. Shirley Horrocks' documentary focuses on the field that Callaghan became a world expert in — magnetic resonance — and interviews Callaghan's family, colleagues, students and friends. The film was invited to play at the 2018 NZ International Film Festival.