Coffee is the great incentivizer in the office.

Dee's search for knowledge was always his greatest strength... and his weakness.

I've published over 100 books - and that is divided about 50/50 adult and young adult. Lately, I have been writing more YA, which is such a great genre to write it. I don't have a favourite (I usually say it's the last book I've written), but certain books do stick in the mind. My very first YA novel, The Children of Lir, will always be special to me, and, of course The Alchemyst because it was a series I'd wanted to write for ages.

Research is always the best part. As we dug deeper into the history and mythology behind each of the hallows, we discovered more and more stories - some of them deserving of novels in themselves.

But the truth is a double-edged sword; it is a dangerous thing.

My specialty is mythology.There are artifacts like the hallows scattered through just about every mythology. However, what makes the Celtic hallows so interesting is that they are a self-contained group of objects.

Villains often more the story along while the heros react to the villains, so the villain becomes the engine of the story.