Harriet Homes and The Celts Book of Spells

'Harriet are you sure you left it here?' asked her one and only friend Carole 'because if you did then it's not here now is it?' 'Blind I'm not so if it's not here then someone must have either borrowed it or we have a no-good thief in our midst so who do you think that could be?' was what Harriet wanted to know. So what was it and would they find it before they and the entire universe went boom-bang-boom.