Loner Sam's life is transformed when he comes into possession of a gun and starts to break the law. His ambitious policewoman sister Gina is paid to uphold it and makes it her mission to find the owner of the weapon. The family saga plays out against an inquiry into the shooting of a local businessman that raises questions for Sam and Gina about their father's murder when they were young children.

Smile is about a woman in her fifties and how she has to navigate day to day sexism, the fall out of sexual assault and how in the end she decides to fight back.