The Castle on the River — Janice N. Bennett

It was four years since Aurora had fled the huge, ugly castle on the Hudson; four years since she had seen the man who had not been able to choose between his disapproving family and his wife. -- But Aurora had returned...Having never stopped loving Eric von Leyden, who now lay paralyzed in his bed after a near-fatal plane crash, the beautiful, spirited young woman was once again prepared to face the hostility of the haughty von Leydens.

It was with disbelief, then mounting horror, that Aurora realized that resentment had turned to murderous hatred - that someone in the monstrous, isolated castle plotted to turn love rekindled into death eternal...