Letting Go by Cat Clarke

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...A gripping and moving story of love, loss and finding yourself from an award-winning YA author. Particularly suitable for struggling, reluctant or dyslexic readers aged 14+