When four unsuspecting schoolchildren stumble upon a golden bracelet whilst out hiking on a school trip, little do they realise the implications of their actions, for this is Arthur`s Amulet, the magical talisman that protects King Arthur and his Knights while they sleep peacefully under Moel Arthur until the day of judgement comes when they must awaken to fight their final battle against the forces of evil. The children must return the amulet safely to Vivienne, the lady of the lake, by midnight before the terrifying messengers of the four horsemen of the apocalypse come to claim it for their masters and wreak death and destruction on the world. Sounds simple? But first they have to sneak past their suspicious teachers and outrun the devilish Cun Anwen hounds.