When Skulduggery and Valkyrie are invited to a ball in New York, they find themselves amongst Shadowhunters, Werewolves, Warlocks and *shudder* vampires. While Skulduggery helps out the adults, Valkyrie is left to make friends with another teenagers...

When Clary and the gang travel to Dublin to meet up with Magnus' old friend Skulduggery, they never expected to be caught up in all the drama and adventure in Skulduggery's world, just as the drama in their own had settled down. Post CoG and Mortal Coil