From a frozen hillside, twenty-three-year-old Matud n watches his uncle murder the King of Ulaid and seize his throne. By sunrise, Matud n is hunted, carrying only his father's ring and an oath: I will take back what is ours.
But Ireland's kings will not simply hand him a kingdom. Matud n must prove through judgement and deed that he is more than the angry son of a murdered king.
Then Ivar the Boneless turns his longships north.
With too few ships to meet him, Matud n makes a dangerous bargain with Eira Ketilsd ttir, a Norse exile with her own blood-debt against Ivar.
She brings ships, warriors and the knowledge to make Ivar bleed.
She also brings Norse axes inside Ulaid.
As black sails gather off the coast and his enemies twist every choice against him, Matud n must decide what he is willing to sacrifice to reclaim his father's kingdom.
Winning a battle may prove easier than winning a kingdom.
Matud n wants Ulaid back.
The harder question is whether he can take it without becoming the man who stole it.