When 93-year-old Thelma Post gets duped by a phone scammer pretending to be her grandson, she sets out on a treacherous quest across the city to reclaim what was taken from her. Inspired by a real-life experience of writer-director Josh Margolin's own centenarian grandmother, Thelma puts a clever spin on movies like Mission: Impossible, shining the spotlight on an elderly grandmother as an unlikely action hero.