From The Portable Jung, chapter six, “The Phenomenology of the Self…” Jung writes, “Closer examination of the dark characteristics–that is the inferiorities constituting the shadow–reveals that they have an emotional nature, a kind of autonomy, and accordingly, an obsessive or, better, possessive quality. Emotion, incidentally, is not an activity of the individual but something happens to him.”
In my novel, ANIMUS, A Jungian Thriller, I’ve tried to put my main character in exactly this position. He’s forced back into law-enforcement to stop crimes against his patients. It seems like his own dark characteristics are rebelling against him–and seem to get worse and worse–even as he works his way through them to solve the crimes.