Scotland, 1863. In an attempt to escape her past, Bessy Buckley takes a job as a maid in a big house outside Edinburgh working for the beautiful Arabella. Bessy is intrigued by her new employer, but puzzled by her increasingly strange requests and her insistence that Bessy keep a journal of her most intimate thoughts.

And it seems that Arabella has a few secrets of her own - including her near-obsessive affection for Nora, a former maid who died in mysterious circumstances. Then, a childish prank has drastic consequences, which throws into jeopardy all that Bessy has come to hold dear. Caught up in a tangle of madness, ghosts, sex and lies, she remains devoted to Arabella. But who is really responsible for what happened to Nora?