Their troubled past behind them, married couple, Rob and Louise, visit Venice for the first time together, looking forward to a relaxing weekend. Not just a romantic destination, it's also the most haunted city in the world and soon, Louise finds herself the focus of an entity she can't quite get to grips with - a veiled lady who stalks her.

After marrying a young Venetian doctor, Enrico Sanuto, Charlotte moves from England to Venice, full of hope for the future. Home though is not in the city; it's on Poveglia, in the Venetian lagoon, where she is set to work in an asylum, tending to those that society shuns. As the true horror of her surroundings reveals itself, hope turns to dust.

From the labyrinthine alleys of Venice to the twisting, turning corridors of Poveglia, their fates intertwine. Vengeance only waits for so long.