Abhorsen by Garth Nix (2008) Harper Teen

The third volume in the Abhorsen series set in the old kingdom and Ancelstierre, where Lirial must use her powers as the Abhorsen in waiting and as a Remembrancer to defeat the ultimate evil that seeks to destroy the world. Sabriel, the Abhorsen, and Touchstone are threatened with assassination. Sameth and Ellimere, their children are left in charge. Samuel wants nothing to do with the dead. Moggert is along for the ride and a Disreputable Dog. The tension winds up all the way to the end - this is epic fantasy.