Peter Tremayne is the fiction pseudonym of a well-known authority on the ancient Celts, who has utilised his knowledge of the Brehon law system and 7th-Century Irish society to create a new concept in detective fiction.

Peter Tremayne is the fiction pseudonym of a well-known authority on the ancient Celts, who has utilised his knowledge of the Brehon law system and 7th-Century Irish society to create a new concept in detective fiction. Less