Postcards From Valhalla

Viggo's brother is missing in Shetland, the same place Viggo's dad went missing five years ago and is now 'missing presumed dead'. Viggo and his Mum go to Shetland but he is triggered by strange visions when they set off. Soon he is finding it difficult to separate fact from fantasy... and who knows what terrors lie in wait for him deep beneath the ground?