When Skulduggery learns of a plot to resurrect a terrifying evil, he persuades Valkyrie to join him for just 24 hours. But they need someone else on their team, someone inconspicuous, someone who can go undercover. Enter Omen Darkly. Student at the new Corrival Academy. Overlooked. Unremarkable in every way. 24 hours to save the world. One sharply-dressed skeleton. One grief-stricken young woman. One teenage boy who can’t remember which class he’s supposed to be in. This cannot end wellà.