Gaslight Grail (2017)

In 1916, poised, brutal, and agoraphobic Charlotte grants timid and abused Amelia eternal life. The two spend a century together locked away in a decrepit mansion in the middle of the desert. Charlotte's agoraphobia deepens, while Amelia grows weary of their existence and of Charlotte's overbearing manner. One day, a man's car breaks down outside their mansion and Amelia welcomes him into their home and slowly begins to unravel the web of Charlotte's lies about eternal life.