The Open House

When a suburban father is killed by being smashed by a car whose driver appeared to have had a heart attack, his family struggles to come to terms with their loss. Unemployed and financially unable to support herself and her teenage son Logan, the mom, Naomi, agrees to move into her sister's secluded mountain mansion until it sells. Upon moving in, Naomi and Logan encounter their elderly neighbour, Martha, who behaves strangely, and Chris, a pleasant store clerk. Read more on Wikipedia.