Conaire Mór's reign has ushered in a period of great happiness and good fortune, but his three foster brothers take advantage of his position and plunder the countryside. Conaire refuses to put them to death, however, and out of brotherly love banishes them to Scotland where they fall in with merciless sea pirates who raid the coasts of England and Ireland, brutally slaying all whom stands against them, until finally the three brothers come back to the land of Conaire Mór.