The few case studies I read are concerned with analyzing the dynamic as opposed to residual effects on the client. Someone at TELL suggested I read the books about sexual abuse, explaining the exploitation's core was the dynamic surrounding the sex as much as the act itself.

Two books then: Penfold, PS., Sexual Abuse by Health Professionals: A Personal Search for Meaning and Healing.

Plasil, E., Therapist: The Shocking Autobiography of a Woman Sexually Exploited by her Analyst.

From this list. http://www.therapyabuse.org/RS_sugreadings.htm

On power:
Dorpat, TL., Gaslighting, the Double Whammy, Interrogation, and Other Methods of Covert Control in Psychotherapy and Analysis.

UK books , hard to get:
Bates, Shouldn't I be feeling better by now (an anthology)

Sands, Falling for Therapy (though by a patient, written in professional style, and a slog. But I thought insightful.

Others that should be available:
Dineen, Dr. Tana Manufacturing Victims, What the Psychology Industry Is Doing to People.

Dorothy Tennov Psychotherapy: the Hazardous Cure

Striano, Judi: Can Psychotherapists Hurt You?

Used books sources include alibris, addall and abebooks as well as amazon.

Book and ebook Therapy Beyond Modernity Richard House, discusses three client books about harmful therapy. This professional book also is a slog.
https://books.google.com/books?id=9L0qyJ0yzq0C

I found reading/viewing cult accounts both frightening and helpful.

My blog linked below is an attempt at my describing emotional exploitation. It has elicited comments for 7 years now.

I found it most helpful to demote the therapist from his elevated status and see him as a flawed, needy, defensive human. As painful as it was, I had to look at how I was duped. I had to hold my own narrative, as opposed to the therapists' "authoritative" ones. I also looked at how the framework of therapy primed both of us for our delusional thinking.

After my destructive therapy life's demands and a necessary job move probably saved me from a downward spiral. A couple of friends helped my perspective. Wishing you all the best.