A sinister Countess is driven mad by a dark secret. An innocent woman is made the instrument of retribution. A murdered man's fury reaches beyond the grave.

When Countess Narona marries Agnes Lockwood's fiancé and takes him to live in a rundown Venetian palace, a servant mysteriously vanishes and the husband dies a recluse. But the dead won't rest. When the palace is transformed into a hotel the two women are drawn to its chambers, where a force stronger than death is waiting to wreak its vengeance. . .