Dancing with Demons (Sister Fidelma Series #16)

In the late 7th Century, the High King of Ireland is killed at night in the middle of his compound. Who killed him is not in question - there are unimpeachable witnesses that point directly to the clan chieftain responsible. Dubh Duin is, after all, found by the High King's guards in the High King's bed chamber holding the murder weapon. But with impending civil war in the balance, the motive for the murder becomes of paramount importance.
The Chief Brehon of Ireland asks Fidelma of Cashel ...