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 from 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, they came a-cropper. For the Emerald Isle was not where it ought to be. Instead it was drifting rapidly westward under some strange power. Now who would hijack a whole land of legends and fair lassies? And how was it done--and why?