The Island Snatchers

Flying machines had not yet been invented on Earth's dimensional twin, Annwn. So Dylan MacBride thought it would be a good idea, even if a bit on the crackpot side form the viewpoint of that world's somewhat backward Victorian viewpoint.

But when Dylan and his witch wife Clarinda tried out the machine by flying to Hibernia to attend a wild Irish wedding, the come a-cropper. For the Emerald Isle was not where it ought to be. Instead it was drifting rapidly westward under some strange power.