Castle is the second book in Garth Nix

Garth Nix

Garth Nix is an Australian author of young adult fantasy novels, most notably the Old Kingdom series, The Seventh Tower series, and The Keys to the Kingdom series. He has frequently been asked if his name is a pseudonym, to which he has responded, "I guess people ask me because it sounds like the...

's The Seventh Tower

The Seventh Tower

The Seventh Tower is a series of six books written by Garth Nix, the result of a joint partnership between Scholastic and LucasFilm. The series follows two children from distinctly different societies in a world blocked from the sun by a magical Veil which leaves the world in complete darkness.Tal...

 series, published in 2000 by Scholastic. The cover design and art are by Madalina Stefan and Steve Rawlings respectively.

Plot

Tal and Milla make it from the shadowy 'Dark World' to the titular castle, a seeming place of peace. Both are unwanted by the castle's inhabitants, Milla the most. The two must avoid conspiracies and other dangers inside the castle, just to survive.