Rosalie is walking her favourite cliff path when a storm blows in. While sheltering in a small cave, she becomes trapped. With no certainty of rescue, time weighs heavily, and memories of her son Jonnie, a climate activist lost at sea many years ago, come flooding back unbidden. Her only companion, an injured bird, bears silent witness as Rosalie reflects on how Jonnie’s death has impacted her life. How she felt compelled to fight for the planet too. But her friends and family don’t understand and seem not to care. Can’t they see that there is no Planet B? And will she be able to find a way out, back on to the path?