The Line of Mothers is the story of Fen, a princess of the Pict people and the last in the line of mothers. This story tells of the tumultuous times of the eighth century when the Pict people ruled the lands but were succumbing to increasing attacks by the Scots and the Vikings. To form an alliance between their people and provide a united force against the Vikings, Fen is married to the son of a Scottish ruler. This gives any son of hers the birthright to rule all of the Pritani - but unseen forces are conspiring against her and the continuation of the line of mothers.