He's dead! screamed Mahon, his face as white as his tunic...'

In the Ireland of Saint Patrick and the Brehon Laws, Drumshee is shaken by a terrible crime. Gabur, the cruel assistant brehon, is found murdered - and Mahon, one of his young students, is everyone's main suspect.

But when Ita and the other law students start investigating, they discover that Mahon was far from the only person with a reason to want Gabur dead. Can they prove his innocence before it's too late?