“The Occupant” is a strangely frustrating movie. It stays engaging through the sheer force of a committed performance that anchors every single scene of the film, but it’s also so hard to get your arms around thematically (or even narratively) that it pushes you away. “Run Sweetheart Run” star Ella Balinska, who I believe is in every single scene of Hugo Keijzer’s film, plays Abby, whose sister Beth is dying of cancer. Refusing to go along with her father’s advice to plan for the end of her sister’s life, Abby takes a crazy job to raise the funds for an experimental treatment: working at a uranium mine in Northern Georgia (the country, not the state).