408, an Irish king desperate to save his clan raids the Welsh coast for slaves and plunder.
But when he steals Anwyn across the sea, a Roman patrician's son embarks on an impossible quest to bring her back.
Macrath will do anything to save his clan, a people cursed after the red wolf appeared to him three years ago.
When he returns from a disastrous raid, he pleads with Athairne, an outcast druid, for help.
Athairne receives a vision from the Great Light that co.