Anne Forbes 
Firestar [EPUB ebook] 

What could possibly send NASA scientists scurrying to a sleepy glen in the Scottish Highlands? Firestar, the heart of all magic, is under attack by a hidden enemy, and both the human and magical worlds are shaken to the core. As hobgoblins strive to outwit the world’s top scientists, the Lords of the North try to protect Firestar. Can Neil, Clara and Lewis help to uncover the real menace and save their magical friends? The fourth fantastic adventure in the Dragonfire series.