Winter 1899, and strange things are afoot. As the new century approaches, English hack writer Evelyn Dolman marries Laura Rensselaer, the daughter of a wealthy American plutocrat. But in the midst of a rift between Laura and her father, Evelyn’s plans for a substantial inheritance look to be dashed.

Arriving in Venice for their belated honeymoon at Palazzo Dioscuri – the ancestral home of the charming but treacherous Count Barbarigo – the couple are met by a series of seemingly otherworldly occurrences, which exacerbate Evelyn’s already frayed nerves. Is it just the sea mist blanketing the floating city, or is he really losing his mind?