Successful artist Isabel Ramsay has never come to terms with the tragic death of her mother. Haunted by what happened, Isabel finds her own life spiraling out of control until, one winter's day, she gives up, unable to bear the pain of living any longer. Yet somehow she wakes up, remembering a vision of a mysterious woman who has saved her. But alone in a locked house, surely that's impossible? With her family and friends worried out of their minds, her husband Angus finds a companion to watch over Isabel while he's away from home. Warm, wise Clara can connect with Isabel in a way no one else can, helping her face up to her painful past, rediscover her passion for art and become brave enough to live her life again. But there's a mystery surrounding Clara: who is she, and why does Isabel feel she's known her all her life?