After a series of unusual encounters, it is obvious to those that know her best, that Kathy Deane is not herself. Then comes a devastating diagnosis, and she leaves the safety of her marriage to Tim for a man she barely knows. The mental illness causes her to behave irrationally and affects her capacity for empathy. She becomes aware that she is unaware. Nick seems wild and free, and is the change that Kathy needs. He takes her to his childhood home, around the marshes in north Kent. It's here that she is able to reconnect with herself and find some hope for the future.