A new play by Jack MacGregor, staged at Assembly Roxy as part of the Edinburgh festival 2026, follows a Scottish researcher named Kerris who arrives on the fictional island of Saint John, a remote British Overseas Territory in the South Pacific, and becomes drawn into the activities of a secretive religious community. The Guardian's review praises the atmospheric, well-acted production but finds its storytelling ultimately elusive, arguing it fails to offer deeper insight into what makes cult-like devotion appealing in the first place.

Directed by Fraser Scott, the drama sees Kerris (Rebecca Wilkie) welcomed by former merchant seaman Joe (Xander Cowan) while she investigates both plant life and the island's nightly church services led by an enigmatic "prophet". The review notes promising hints of political intrigue and colonial cover-up, but says the play loses focus once it shifts towards Kerris's own underdeveloped backstory, leaving audiences at a distance from the cult itself and with only a surface-level takeaway that such movements are harmful.