A Man of Passion is a soul-searching journey that documents the developing relationship between George (Ramon Estevez) and his unconventional grandfather, Mauricio (Anthony Quinn). George's ambitious mother, stage actress Gloria (Elizabeth Ashley), decides to send the boy to stay with her father while she travels in pursuit of fame, forcing George to step out of his comfort zone. Mauricio is a larger-than-life, retired artist living on a Mediterranean island whose unique outlook on things helps his nervous grandson become accustomed with the finer points of life. George watches his grandfather interact with various women giving answers to questions that involve higher meanings such as love and sex. His assistant Basilio (Ray Walston) and the friendship between the two aging men add to this story of growth and learning in a unique and funny way. Mauricio's eccentric approach unlocks the awkward and timid child's spirit making his influence pivotal to George's growth.