Funny, moving, and deeply human, I Swear tells the remarkable true story of John Davidson, a Tourette Syndrome campaigner whose humour and honesty helped the world better understand the disorder. Robert Aramayo plays Davidson, whose life was irrevocably changed at 15 years old when he developed uncontrollable vocal and physical tics. Tourette Syndrome was barely understood at the time - even by doctors - causing John years of isolation, anxiety and shame.