1899. As the new century approaches, struggling English writer Evelyn Dolman—a hack, by his own description—marries Laura Rensselaer, daughter of an American oil tycoon. Evelyn anticipates that he and Laura will inherit a substantial fortune and lead a comfortable, settled life. But his hopes are dashed when a mysterious rift between Laura and her father, just before the patriarch’s death, leads to her disinheritance.

The unhappy newlyweds travel to Venice to celebrate the New Year at the Palazzo Dioscuri, ancestral home of the charming but treacherous Count Barbarigo. From their first moments in the mist-blanketed floating city, otherworldly occurrences begin to accumulate. Evelyn’s already jangled nerves fray further. Where has Laura disappeared to? How to explain the increasingly sinister circumstances closing around him? Could he be losing his mind?