House of Hate — Dorothy Fletcher

The stately mansion of the Thibaults was filled with the treasures and the memories of gracious living...but it held more than that. The world of the Thibaults had been shaped by art and by music, but something in the house seemed to feed on a vicious undercurrent of fear and frustration. When Norma Theale came on a mission of mercy, she became a catalyst, around which a storm of dark furies gathered...waiting to burst and spew its evil over all. Because Norma was there, someone was going to die...

Would that someone be Norma herself?