Led by a brilliant performance from Robert Aramayo (Nocturnal Animals), I SWEAR chronicles the true story of Tourette Syndrome campaigner John Davidson.

1980s Britain. Showing signs of with Tourette’s syndrome at 15 years old, John Davidson (Aramayo) lives with a disorder little understood by his peers and the community at large. Initially alienated from his friends, family, and those around him, Davidson perseveres in his attempt to live a 'normal' life. Eventually getting a job amongst people that understand his situation, he soon finds purpose in campaigning to raise awareness for Tourette’s.