Cyfres o dair nofel ditectif sy'n canolbwyntio ar fywyd a gwaith Inspector Arthur Goss. Lleoliad y nofelau yw Berig, tref arfordirol ffug yng ngogledd orllewin Cymru, lle mae'n rhaid siarad Cymraeg.
A series of three detective novels which focus on the life and work of Inspector Arthur Goss. the novels take place in Berig, a fictional town on the north-west Wales coast, where speaking Welsh is mandatory. However despite looking like a Welsh utopia, the town is run by the local mafia who try and maintain Berig's positive appearance by any means possible.