When Clara Eden is offered a job as an archivist working for eccentric estate owner Agatha Montague, she thinks her prayers have been answered. Soon, she finds herself sucked into her research world, captivated by a romantic correspondence thousands of years old. But as her feelings for her employer's assistant, Fiadh, deepen, so does her suspicion that something about Agatha Montague isn't right. Unfortunately for Clara, it is far too late to run by the time her suspicions are confirmed.