AD367: Britannia. The Southern Provinces are shaken by the most ferocious barbarian invasion in living memory. Marius, youngest member of the Corinium council, is caught in a web of intrigue when it transpires that the traitor masterminding the barbarian alliance is his parents' murderer, the feared and hated Imperial Notary, Paulus Catena - The Chain... Narrowly escaping death in a bloody skirmish with an Irish war band, Marius is forced to undertake a hazardous journey to the mysterious Isle of Mona in a desperate gamble to destroy the alliance. He is accompanied by the fugitive slave and...