If You Can't Save Me, Save Yourself.

Valkyrie Cain has disappeared into the darkest recesses of her mind and Skulduggery, no matter what he does, can't reach her. It's up to him and others alike to bring her down, before she brings down the world, but when things get deeper and deeper into death and destruction can Skulduggery hold up his side, or will he fall down into the darkness like his partner?