An invisible princess, a magic ring, and more adventures than you could dream of. This is what Gerald, Kathleen and Jimmy find when they stumble upon a mysterious castle. At first it all appears to be a lark. But the children soon discover they need all their bravery and ingenuity to contend with the castle's supernatural forces.

Language: English

Published in: 1907

Word count: 68,352 words (≈ about 5 hours)

Copyright: This work is available for countries where copyright is Life+70 and in the USA.