I Swear tells the extraordinary true story of John Davidson, who was diagnosed with Tourette’s Syndrome at age 15, during a time when the condition was largely misunderstood. A rift develops between John and his long-suffering mother, Heather (Shirley Henderson), when he forms a bond with Dottie (Maxine Peake), the terminally ill mother of a school friend. As an adult, Davidson (Robert Aramayo) emerged as a tireless campaigner for awareness and acceptance of the condition, working as a community caretaker and founding a support network for individuals and families affected by Tourette’s, advocacy work for which he received an MBE in 2019. I Swear explores Davidson’s journey from isolation to empowerment, illustrating how he embraced his identity and inspired a new, compassionate understanding of Tourette’s Syndrome.