The Third Tower — Alice Abbott

When Ruth Hood accepted a job as companion to Richard Gordon's blind daughter, her only thought was to help the little girl. But Richard's housekeeper had always been the girl's guardian, and his second cousin Carol was not about to sacrifice either Richard or his wealth to Ruth's happiness when Richard offered her marriage.

It was obvious to Ruth that someone in the household was obsessed by the need to keep her from marrying Richard. When fire nearly claimed her life, and a voice from beyond the grave threatened her, the truth was frighteningly clear. Someone wanted her dead--but who?