Archaeologist Deian returns to the island of his childhood, where his mother disappeared without a trace. Sister Viv, closet heretic and host of the annual conference of hermits, has erected a gold plaque in her memory, declaring her unofficial sainthood. Meanwhile, documentary-maker Leri is keen to portray the island's inhabitants as anything but saintly, pursuing a story that has less to do with birds and saints' bones than with real bloodshed.During this hot August week, a writer-in-residence observes lives colliding, as Bardsey Island twirls once more for the cameras.
Archaeologist Deian's mother Delyth had disappeared, the only sign of her left on the island was a black and gold plaque declaring her unofficial sainthood. This heresy Sister Viv fails to prevent her fellow-hermits discovering during their residency, which is ruled by a vow of silence that includes her dog, Elfyn.