They Were Trapped By Their Forbidden Love
“Miriam Gardner” was actually a pen-name for Marion Zimmer Bradley
From the back:
Dr. Nora Caine’s voice rose in anguish as she faced Jill across the room, shaken by the fervor and passion of the other girl’s kiss. Precise and scientific on the outside, Nora was still a woman — passionate and longing to love and be loved. She thought of Kit, her husband, a helpless cripple in a hospital bed, and felt a pang of remorse and pain. Yet, here was Jill, a tempting child-woman whose elfin beauty and sexuality were luring Nora away from her husband.
And to complicate things further, there was Mack — big, strong, virile Mack who was Nora’s stepbrother and Jill’s lover. These four people caught in their own private purgatory, struggled against overwhelming odds in their frenzied search for emotional happiness. Things came to an awful climax now as Jill told Nora in a passionate outburst of feeling:
“THE IDEA OF SLEEPING WITH A MAN MAKES ME SICK!”
Great find!