Skulduggery Pleasant Series 6 Books Collection Set by Derek Landy

Skulduggery Resurrection
A lot has changed. Roarhaven is now a magical city, where sorcerers can live openly. Valkyrie Cain has been out of action for years, recovering from the war against her alter-ego Darquesse, which nearly destroyed her and everyone else.

Skulduggery Midnight
For years, Valkyrie Cain has struggled to keep her loved ones safe from harm, plunging into battle – time and time again – by Skulduggery Pleasant’s side, and always emerging triumphant.

Skulduggery Bedlam
On a desperate journey to recover her sister's lost soul, Valkyrie Cain goes up against the High Sanctuary itself, and there's nothing Skulduggery Pleasant can do to stop her.

Skulduggery Seasons of War
War is coming.

To avert catastrophe, Skulduggery and Valkyrie are sent on a secret mission that takes them away from everything they know, to a forsaken land of magic and grim, unrelenting terror.

Skulduggery Dead or Alive
Billions of lives will be wiped away in a final, desperate search for the Child of the Faceless Ones ― she who is destined to bring about the return of humankind's ancient overlords.

To prevent this, Skulduggery Pleasant and Valkyrie Cain have one last – terrible – the assassination of Damocles Creed.

Skulduggery Until the Vol. 15
The Faceless Ones have returned to our universe. The bad guys have won.

With the end of everything just days away – and no longer able to rely on Valkyrie Cain – Skulduggery must make allies of enemies if he's going to stand any chance of saving what's left of the world. And just when things are looking their bleakest, they manage to get even worse, with Omen Darkly suddenly having to step up when his brother, the Chosen One, falls.