The Secret of the Sphinx

The students of the “Crystal” school are confused: their friend Frankie disappeared during the last clash with their common enemy, Andrew Melling! All they can do is guess where he is and whether there’s any danger to his life. But finally, a coded message arrives from Frankie. Karag and his classmates learn that their friend is in the enemy’s lair and is forced to pretend to be a supporter of Melling! How soon will they unmask him? And most importantly—how can he get out to freedom? The kids absolutely must come up with a brilliant rescue plan! Otherwise, poor Frankie faces deadly danger…

“Dynamic, gripping, and clever!” — a bestseller according to the German magazine Spiegel.