Skulduggery Pleasant: the Faceless Ones

This is the third book of the Skulduggery Pleasant series. Valkyrie is now foruteen, and knows much more magic. The evil group known as the Diablerie emerges again, this time recruiting Billy-Ray Sanguine. Valkyrie and Skulduggery make an effort to protect the last remaining Teleporters, as they are the only ones who can open the gate to let out the Faceless Ones, the gods that will, eventually, destroy the world. However, all but one of the Teleporters are killed, and then Skulduggery and Valkyrie go on a wild Goose chase to find the Grotesquery's body and to stop the Diablerie from releasing the faceless ones. But will they suceed?