Bored during a Christmas break, William decides to go looking for wolves as he heard that some have escaped. During his seach ends up chased by a large sparkling dog. He witnesses Kiryl being abducted, he then goes with Professor Gamma to find Kiryl.
The second of the adventures with Professor Gamma, this one themed around light and heat. I really enjoyed the illustrations and how action-packed the story was despite its length, with a satisfying conclusion.