Every year, three million single women in America move into an apartment for the first time. Few of them change the locks.

Juliet Devereau can't believe her luck: after weeks of looking for a place to live, she's found a beautiful, spacious apartment overlooking Brooklyn Bridge. It almost seems to good to be true.

It is... Over the weeks, a chilling sense of being watched stalks Juliet. Strange sounds wake her in the night, the mirror in the bathroom trembles, and doors she thought shut are open. Then the silhouette of a man standing in her living room makes her realise that she's not alone in there. But what's haunting her is far more terrifying than a malevolent spirit; it's alive, strong and obsessed. Suddenly Juliet is caught up in a deadly game of cat and mouse, and there's no guarantee that she'll come out alive...