The Keys to the Kingdom

Seven days. Seven keys. Seven virtues. Seven sins. One mysterious house is the doorway to a very mysterious world -- where one boy is about to venture and unlock a number of fantastical secrets.

Mister Monday by Garth Nix (US)
Mister Monday
Book 1

Grim Tuesday by Garth Nix (US cover)
Grim Tuesday
Book 2

Sir Thursday by Garth Nix (US cover)
Sir Thursday
Book 4

Lady Friday by Garth Nix (US cover)
Lady Friday
Book 5

Lord Sunday by Garth Nix (US cover)
Lord Sunday
Book 7