Fringe First award-winner and Wardrobe Ensemble member Tom Brennan returns to the Edinburgh Fringe with Overtone, an intimate, gripping new play produced by the North Wall. A non-linear two-hander, the production follows a couple grappling with the long-shadowed aftermath of a coercive, abusive relationship with their former choir master, Alan. Years later, as a couple, they are forced to confront the consequences and blurred boundaries of that shared trauma. A striking visual motif involving a curtain pulling back from a window mirrors the slow, haunting revelation of truth. Inverting the traditional choral ideal of unity into something deeply toxic, Overtone builds to a shocking conclusion.