The Keys to the Kingdom

1. 

   Book 1

   Mister Monday (The Keys to the Kingdom, Book 1)

   Garth Nix

2. 

   Book 2

   Grim Tuesday

   Garth Nix

3. 

   Book 3

   Drowned Wednesday

   Garth Nix

4. 

   Book 4

   Sir Thursday

   Garth Nix

5. 

   Book 5

   Lady Friday (The Keys To The Kingdom)

   Garth Nix

6. 

   Book 6

   Superior Saturday

   Garth Nix

7. 

   Book 7

   Lord Sunday

   Garth Nix

Book data and covers from Open Library (openlibrary.org).