The winter sea / Susanna Kearsley.

1707. Jacobite rebels are conspiring to sail the exiled James Stewart into Scotland from France to reclaim his crown. When Sophia Paterson arrives at Slains Castle, she finds herself in the middle of their dangerous plot. Present day. Carrie McClelland is enchanted by the ruins of the castle and hopes to turn this all-but-forgotten story into her next bestselling novel. Settling in the village in the shadow of the castle, she creates a heroine named after one of her ancestors and starts to write. Discovering her novel inexplicably contains more than she can remember researching, Carrie wonders if she is dealing with ancestral memory – making her the only living person to know the truth of what happened all those years ago. With each new chapter she uncovers the secrets of the past in a sweeping tale of love, loyalty and ultimate betrayal.