The series chronicles the adventures of a boy named Arthur, who becomes involved with a magical world called the 'House'; he is on a quest to take back the House from seven antagonistic 'Trustees'.

He discovers there exists a world called the 'House', which is split into seven parts, each ruled by a 'Trustee', of which Monday is one.

In the first book, Arthur defeats Monday and takes control of the first part of the House.

Nithlings are creatures that come into existence out of the magical substance 'Nothing'; they can kill Denizens and go to the universe freely, becoming sprites.

The substance called 'Nothing' causes damage to things in the House and ultimately wipes it out when the Will is complete.

[1] At the 2012 Texas Book Festival, Nix stated that "(I) have no plans for movies but would like to see a card game.

"[citation needed] As of 2019, Herschend Entertainment Studios have secured the film and TV rights to the series, with Nix set to act as executive producer alongside Julie Philips, the vice president of Herschend.