Twenty-five year-old east Belfast man Stevie meets forty-nine year-old Glaswegian widow Martha while recovering from a painful breakup with his ex-girlfriend. Stevie and Martha are immediately attracted to each other. Although their relationship is based entirely upon sexual attraction, they find themselves falling in love.

This challenges the expectations of Stevie's conservative Christian mother and his ultra-Unionist, Ulster-Scots-speaking sister who work hard to break the pair up. Stevie and Martha must decide if their relationship has a real future and if they can both overcome the pain of their heartbroken pasts.

While primarily a hilarious comedy, Can't Forget About You touches on deeper themes such as grief, loss, sexual mores, cultural identity, sectarianism, generation, and the question of how Northern Ireland moves on from the politics of the past and faces the future.