On holiday in Cornwall the three Drew children discover an ancient map in theattic of the house that they are staying in. They know immediately that it isspecia... » 

On holiday in Cornwall the three Drew children discover an ancient map in theattic of the house that they are staying in. They know immediately that it isspecial. It is even more than that the key to finding a grail a source ofpower to fight the forces of evil known as the Dark. And in searching for itthemselves the Drews put their very lives in peril. «