So, the children get their Great Uncle Merry to help and protect them. After many exciting adventures, they find the chalice. But to protect it from capture, they throw it to their great Uncle whose waiting for them in a boat just off the shore. Great Uncle merry catches the chalice but a tube which was inside it falls into the sea. This is going to be the start of a new adventure for the Drew brothers and sister.
The idea of setting the story in Cornwall came to me after long, hard thinking. In the first place, it had to be somewhere in England because the adventure relates to the legend of King Arthur and his knights. In the second place, I did not want to set the story in an imaginary place but, in a real place which was still full of mystery. After putting all this together, I came up with Cornwall. It's a very remote seaside part of England. It's also a very exciting and mysterious place. Many ancient artifacts were discovered there over the years and the weather in Cornwall is mostly foggy and dark much of the time. Therefore, it has a very adventurous, ancient and dangerous atmosphere. I thought, because of all that, it would be an ideal setting.
The three children, of course, are very brave. However, they are also very knowledgeable.