There is no one size fits all when it comes to mental illness, and in Felicity Huxley-Miners’ In the Shadow of the Mountain we see two very different manifestations in the story of one extremely dysfunctional relationship. First, we meet Rob, who’s just found out his girlfriend slept with his best mate and is so devastated he’s thinking about throwing himself under a train – until Ellie explodes into his life and makes it her mission to save him. One thing leads to another, and Rob ends up back at her place… but Ellie has problems of her own, and as her behaviour becomes more and more erratic Rob starts to wonder what he’s got himself into.

On an otherwise fairly minimal set from Emily Megson, low-hanging “clouds” made out of crumpled paper covered in scrawled handwriting are an early clue that all is not well – and it rapidly becomes clear that Rob and Ellie’s relationship isn’t a healthy one, although it’s not initially obvious exactly why. The play is clever in the way it tackles our assumptions, and it’s only as it comes to an end that we begin to appreciate why Ellie behaves the way she does, and that her mood swings and manipulative behaviour aren’t something she can control. The seemingly unrealistic intensity of the relationship – eight days in the two are already talking love and marriage – also makes more sense with the benefit of hindsight, although it’s still never quite explained why Rob stays as long as he does, when he’s clearly uncomfortable with the speed at which things are moving and his increasing isolation from friends and family.

It’s interesting to note that although the play does make it clear Ellie isn’t well, the only way we know the exact cause – Borderline Personality Disorder – is through the notes in the programme; her diagnosis is never given in the play itself. This is obviously a deliberate decision, since Rob asks outright and Ellie declines to answer, and in some ways it feels right to avoid sticking a label on her. That said, the play’s final scene feels underdeveloped, and perhaps misses an opportunity to raise awareness of a condition that can so easily be misinterpreted.

There’s also an issue with balance in the story, which becomes increasingly focused on Ellie, leaving Rob and his problems rather out in the cold. Both Felicity Huxley-Miners and David Shears give good performances, and it’s refreshing to see a play about a toxic relationship where the male character doesn’t have the upper hand. But with Ellie stealing pretty much every scene as everyone waits to see what she’ll do next, we get to know little about Rob as a character – which is perhaps why it’s so difficult to put a finger on why he sticks around as long as he does.

In the Shadow of the Mountain takes important steps towards raising awareness of the broad spectrum of mental illness, and Borderline Personality Disorder in particular, and Richard Elson’s production does a good job of capturing, at different moments, the emotional turmoil experienced by both Rob and Ellie. There are areas of the play that could benefit from some more development, but the potential is clearly already there for a powerful and challenging piece of theatre.

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