Demon Thief
Demon Thief is a book in Darren Shan's Demonata series. Though it is the second book in the series, it is a prequel to Lord Loss, the first book in the series. The protagonist is also different from that of the first book. The narrator here is a new character called Kernel Fleck, as opposed to Grubbs Grady, the protagonist of the first book. Demon Thief takes place about thirty years before Lord Loss so most of the characters from the first book did not appear, though a few did. It was also actually the sixth book of the Demonata to be written, although it was the second released.
Plot
Kernel Fleck is a lonely child. He has always been different: he can see strange patches of light in the air around him. Other kids think he's mad. But when he manages to link some of the lights together, he creates a window into another universe, and disappears for several days. When he returns, his memory a blank, his panicked parents whisk Kernel and his younger brother, Art, away from their home, off to an isolated village, to start a new life.