A Viking Moon

What happens when a crazy old lady in a multi-coloured crochet hat gives you an amulet? An amulet which not only belonged to her mother who was a part of secret sisterhood called the "Mhyres an Loor" or "Daughters of the Moon" but also has the ability to transport you back in time. What happens if you don't know any of this when you accept the amulet as a belated thirteenth birthday present and then find yourself face to face with real Vikings?
In this, the first of many adventures Sarah Tremayne finds herself in the Viking world, not knowing how or why she is there. Or even if she'll ever see her beloved Cornish cliffs again. All she knows is that to leave she must save the future of the steading. Can she do it? Will she ever see her Nan and Dad again? And who was that crazy lady in the multi-coloured hat?