Emer Kenny + Jessie Cave: Grawlix @ Espionage

Espionage's labyrinthine stone passageways and inviting doorways are a trap for the curious. If you have no directional sense arrive early as you'll regret missing the start of this show.

Jessie Cave is just recognisable from her role in the later Harry Potter films (most notably The Half-Blood Prince). Here, the neuroses and obsessions of her stage persona make Lavender Brown's relentless pursuit of Ron Weasley seem like a mild flirtation. Delivered in soft tones that recall Mrs Merton and with a backdrop styled like a kids' play area there's an eeriness to Cave's performance as she describes her digital stalking of partners' exes and sets out how she would run and sanitise an orgy.

But wait a minute... Wasn't this meant to be a sketch show called Grawlix? As Cave holds up a crude rendition of a woman's head stuck on a giant lollipop stick and calls it 'Mum' the absence of her writing and performing partner Emer Kenny looks suspicious. A fear arises that Cave is having a Norman Bates turn.

If you can avoid getting lost you won't miss the opening announcement that Kenny wasn't able to make the Fringe and enjoy this performance without it planting fears. Instead of comic strip-style sketches, Cave is showcasing her unnerving and strong solo material. There are also themes and a manner here that Annie Hall fans will recognise. In her own words, it is a work-in-progress where the voices of Cave and her persona blur, but it offers a glimpse of what may be the making of a compelling and intriguing show.