A lot has changed. Roarhaven is now a magical city, a capital, 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.
Some things never change, though: bad people still want to do bad things, and Skulduggery Pleasant is still there to stop them.
When Skulduggery learns of a plot to resurrect a terrifying evil, he persuades Valkyrie to join him for just twenty-four hours.