From NetFlix:

Believing she’s the lone survivor of a global catastrophe, Ann Burden soon learns she’s not the only human alive when a research scientist shows up. But as the two slowly get acquainted, their relationship is strained by the arrival of another man.

Chiwetel Ejiofor, Margot Robbie, and Chris Pine make up the entire cast of this survivor story. As you might expect the tension in the plot is the competition between the two men for possibly the only woman left in civilization. Slow conversation, slow moving events, and no action make for a calm atmosphere that is suspiciously too polite.

Without spoiling your watching, I have to at least say that to enjoy this film your must not be bothered by ambiguity.