Suspicious characters (spoilers)

In the 1st episode, right before she dies, Victoria Appleby holding a globe (world within a world) looks up, weak (heavy with grief) smile, Gabriel? Woman's voice calling for Nathan, presumably Olivia, but she doesn't recognise who it is. The same globe breaks in the car crash, Gabriel moves on?

Harriet possessed by Able North has an interest in the housekeeper, someone with eldritch knowledge. She/he attempts to baptise her, why?

In the scene where Charlotte implies one of the farmhands damaged the engine, John with conviction, says nobody here would do that, all present hold there heads up as he says this, looking her in the eye, except the housekeeper.

Nathan seems to be a focal point for what's happening, the infamous Nathan Appleby, but theres a dark history. In a scene with Nathan and Harriet they discuss his work in London, there's a suggestion that they (nathan & olivia) dabbled in the occult (he has ouija board) and she became damaged, maybe died under his care or suicide but blames himself?

Lara and her mother began to experience disturbances around childbirth, the grandmother doesn't 'admit' to anything, but theres a suggestion that perhaps she knew there was more going on at the time of her daughters problems, perhaps she hoped to escape the troubles? Olivia Appleby dies in the year her son was born, supposing she was disturbed at the time, was this disturbance resulting from dabbling in the occult or something else?

The housekeeper is quick to oblige Nathan when he asks for access to her eldritch skills. She encourages Charlotte to leave then decides to stay herself when she won't. Who are/where the housekeeper, Mr Payne and the travelling preacher?