Princess Irene's great - great - grandmother has a testing task for Curdie.
He will not go alone though,she provides him with a companion - the oddest and ugliest creature Curdie has ever seen,but one who turns out to be the most loyal frind he could have hoped for.

שם הספר
The princess and the goblin
The Princess and the Goblin (Charming Classics)
The Princess and the Goblin (Puffin Classics)
The Golden Key (A Sunburst Book)