"Instabil" tells the story of the encounter between two extraordinary people who cannot live with or without each other. It all begins with a chance meeting in the park. A friendship develops into a romantic relationship, which soon becomes a test of endurance. Abysses open up: he cannot tolerate closeness and regularly runs away, while at the same time putting pressure on her whenever she tries to pursue her own path, even threatening to take his own life if she is not there for him. She witnesses his crises, which often end in the emergency room. Yet she holds on to him. Even more, time and again she takes responsibility for him and his actions, to the point where she nearly loses sight of her own identity. He is a borderline personality and she is co-dependent. Christa Windmüller powerfully depicts the emotional rollercoaster of two exceptional individuals and provides an authentic insight into their lives.