Garth Nix.

His website.

His Twitter feed.

Official Troubletwisters website.

Official Keys to the Kingdom website.

Official Old Kingdom Chronicles website.

Titles I've written about:

Troubletwisters #1 (2011):

Troubletwisters is kind of the Spy Kids of middle-grade fantasy. (There are even gadgets!) Perfectly competent, loads of fun, bound to result in a popular series, but probably not one for the ages... though I'll certainly be reading the sequel.