Sláine: The Brutania Chronicles - A Simple Killing (Sláine #15)

Celtic barbarian warrior Sláine united the tribes of the Earth Goddess and became the first High King of Ireland. After ruling for seven years, he fought for the Goddess, travelling through time to battle her enemies, before returning to save his people from the Fomorian sea devils. Now, he's crossed over onto the Isle of Monadh in an attempt to rescue Sinead from the evil clutches of the Drune Lords...