At the heart of a vast French forest stands a 210-year-old oak. From its roots to its highest branches unfolds an entire world—buzzing, rustling, humming, and at times whispering—home to squirrels, field mice, birds, insects, and countless other creatures. Some coexist in harmony, others compete for space, while for many the ancient tree is a refuge, a source of food, or simply a resting place along the way. Over the course of a year, the film follows the oak and the vibrant life it sustains, revealing the intricate rhythms of the natural world. Told without narration or dialogue, Heart of an Oak weaves breathtaking cinematography, meticulous craftsmanship, and playful editing into a poetic adventure that celebrates the beauty, resilience, and interconnectedness of life, inviting audiences of all ages to experience the forest anew.