Door Into Terror — Juanita Coulson

The Door of Death.

Tamara Powell couldn't know what awaited her on Marteau Island when she arrived to tutor her old friend's son. Felicia had been insistent and now seemed distraught. She needed comfort or was it protection? Who lay behind the evil that boldly stalked the remote mansion? Was it Vincent, Felicia's aloof, strangely enigmatic husband. Or Mordecai, the cold, austere family patriarch who held them suspended before his whims? Or was it in the very air of the Door of Death, in the ghosts of an unforgotten past?