Julian Fellowes has assembled quite a stellar cast here for this rather charming, if formulaic, ghost story set in an English stately home. The young "Tolly" (Alex Etel) comes to live with his aristocratic grandmother "Mrs Oldknow" (Dame Maggie Smith) - who is having to think carefully about remaining in their fire-damaged family home. Once in situ, the young man discovers that he is able to revisit a time in the house's history when things were different, and there were big secrets being kept. Soon he is embroiled in trying to alter history saving those in both timelines before it is too late...