Fallot is a circus-infused physical theatre work about the eponymous heart defect, Tetralogy of Fallot, as experienced by circus artist Marianna Joslin. Company 2 directors Chelsea McGuffin and David Carberry produce Fallot, performed by Joslin, Phoebe Armstrong, Olivia Porter, Casey Douglas and Jake Silvestro.

The show had a developmental run at Brisbane Powerhouse during Wonderland Festival 2017; I missed Fallot then, so I was glad to catch up on my Bris-circus during Adelaide Fringe. In the intimate Empire Theatre tent, I love that you can see more of the physical work of circus by sheer proximity. There’s a lot of muscle and control in Fallot, perhaps fitting for a show that explores the heart muscle’s control over the function of body and mind.

In this particular run of Fallot, Joslin’s role in the show is limited by a recent injury, so she becomes the narrator and shadow of her own story. Joslin has experienced the physical and emotional trauma of several open-heart surgeries, and Fallot is at its strongest when its performers use their physical strength to show the vulnerability that comes with being at the mercy of doctors, anaesthetists and nurses.

The show has a fantastic, uncanny look: screens turn theatre into operating theatre, with freaky robed surgeons contrasting with beige lace and medical corsetry. White hospital sheets are a recurring motif, used as tissu to climb, rope, or costuming. The female performers each embody aspects of Joslin’s experiences, centred around a black operating table on wheels. A standout scene has Douglas and Silvestro, as doctors, shifting their co-performers on, off and around that table, using subtle versions of Company 2’s signature toss-the-girl manoeuvres to rob them of their agency. Another sees nurses weave hospital sheets around Armstong’s legs before hoisting her to the ceiling to float in the limbo of anaesthesia.

Fallot does struggle to settle on a tone. It plays up moments of classic cabaret between pathos-driven scenes, but there isn’t a clear sense of physical narrative between these – it doesn’t quite flow yet. This is most evident in the final scene, a lip-syncing number complete with heart puppets – its weirdness, though not unwelcome, comes from left field. It’s madcap, but inconsistent. Part of the challenge here is that Fallot’s narrative is held together by actual narration by Joslin – some live, some recorded – often overlong and leaning hard on clichés that wind up more tiresome than heart-warming.

Company 2 works with first-rate physical performers, but Fallot doesn’t trust those artists to show (rather than tell) the story. Fortunately, David Carberry’s musical score is a compelling pulse that resonates with the performers and with the beat of our own hearts.

Fallot runs at the Royal Croquet Club at Adelaide Fringe until 25 February.