I think it’s the essence of a ghost or supernatural story that there are things that don’t make sense from a logical point of view. I think it’s more about exploring emotions and psychology. The relationship between Tom and Isha started when Tom was very young, and she was likely the one he was most closely connected to emotionally. But his parents just saw her as a servant who could be dismissed once she’d fulfilled her usefulness. So Tom went through huge trauma: being transported half-way round the world, for reasons he probably couldn’t understand, into a very “foreign” world, and then having his beloved ayah taken away from him. But that’s a “classic” psychological diagnosis which might go some way to explaining Tom’s behaviour or beliefs, but doesn’t explain much beyond that.
I guess the relationship between Tom and Isha is more about belonging and loss. Isha has spent the last hundred years keeping Tom alive, even to the extent of preventing Dorothea from singing the verse that would get rid of Isha. I don’t think it matters whether it was Isha or Tom who pushed Dorothea down the stairs, because (within the story) it was Isha’s motivation – she was a jealous being, and Tom had fallen in love with someone else.
I think Tom had been trying to get away from Isha for a long time. Although he could have got rid of her by singing that last verse, that would have meant consigning her to what? What he wanted for himself was to die in peace, but what happens to a ghost? I think the scene set in the millpond was about Tom sacrificing himself to save the boy. The smile on Isha’s face was that she had kept him alive all those years, but now even death wouldn’t separate them – she would have him all to herself not just for an extended human lifetime, but for all eternity. And that’s a scary version of love gone bad.
I loved this miniseries. I don’t mind that there are unanswered questions because it was about a good spooky drama.
And can I be a bit trivial and say that Sheila Hancock was amazing. I looked her up online – she’s 81 years old, yet still looks stunning, and owned the scene she was in.