It appears that Zeus does not approve of Percy Jackson taking airplanes, even for the perfectly innocent reason of going on holiday to Germany. So that's how it happens that the Seven get stranded in rural Ireland with no where to go but the ominous manor in front of them. As for Artemis Fowl, he's not thrilled with a group of teenagers at his front door asking for directions...

Artemis Fowl has fallen into a time vortex that had brought him to the Victorian era. He does not remember who brought him here or why. After being rescued by Ciel Phantomhive and his demon butler Sebastian, Artemis joins the Earl as he tries to find his parents murderers. Follows Black Butler Anime plot. CielxArtemis.

AU. Imagine if Artemis and Holly never made it back to their own time after N01 sent them back but instead they get sent off to 18th century England in which they come across a certain awful nobleman and his butler.