When Agnes made a promise to her girlfriend Ellie, she thought they would be together forever. One year later, Agnes is keeping that promise and it's put her in a situation she never could have predicted; climbing a desolate mountain, in miserable weather, with Ellie and her new boyfriend Steve.

But when the weather takes a threatening turn and the sky-high tension between the trio hits its peak, Agnes will have to push herself further than she ever thought was possible...