'It is in us all' is not a satisfying watch. It has all the look and self-importance to become a very serious art-house deep dive into a human psychology... or something -from the mysterious characters to sweeping wide shots of the landscapes to an extended scene that nearly amounts to body-horror. I sat there and waited something to happen, to go deeper, perhaps even dark. It didn't. It's all misty to the end.
But at least it made me think about one aspect, which the director may never have intended and I may have totally blown out of proportion, but... I find the dynamic of Anglo-Irish relationship featured in the film rather interesting.
For many British (especially English), Ireland remains something blurry back in their mind. A kind of a little brother figure, still feels like a forgotten part of their nation, somewhere they can always visit and impose themselves on but nowhere they particularly want to be anyway. This attitude you can picke up from Hamish's English father. For him, Ireland is just a backwater, and the difficult relationship of the past (represented by his failed marriage to Hamish's Irish mother) is just water under the bridge. In other word, it's just not worth putting much thought to.
On the other hand, the Irish response to the English visitor is a complex mixture of curiosity, fascination, and veiled suspicion. One moment very friendly, but just below the surface there's hostility that runs deep from their acrimonious past relationship.
Hamish, half Englsih half Irish, sits right between these 2 clashing dynamics, and eventually breaks down in the subtle but unbridgeable gap. He arrivs Ireland first as a totally unsympathetic stranger. Even the fatal car accident doesn't seem to stir him much, and he seems to take it as just something happened. Only when he realises the forgotten Irish root, he finally looks around. He's inexplicably attracted to it, yet he can't really understand it nor fully accept it.
This is just my unsubstantiated rant about the film. But it could be a way to see this rather vague film? The very fact that the director chose an English actor as her leading man for her feature debut, and thus making her own country 'the Other' in the dynamic is a telltale sign.