The Old Kingdom 3 Books Collection Set by Garth Nix (Sabriel, Lirael, Abhorsen)

Sabriel: Sabriel has spent most of her young life far away from the magical realm of the Old Kingdom, and the Dead that roam it. But then a creature from across the Wall arrives at her all-girls boarding school with a message from her father, the Abhorsen - the magical protector of the realm whose task it is to bind and send back to Death those that won't stay Dead. Lirael: Lirael has never felt like a true daughter of the Clayr, a powerful group of clairvoyant oracles responsible for assisting the Abhorsen and the Royal Family in keeping the Old Kingdom safe from the threat of the Dead. Not only does she look completely different to everyone else, she is long past the age that she should have received the Sight. Abhorsen: Besieged on all sides, Lirael, Sameth and the Disreputable Dog are in for the fight of their lives. Chlorr of the Mask, under the control of the enormously powerful Necromancer Hedge, is determined...