Destiny's brother - Michael Moorcock

'I am Oona, the shape-taker, Grafin von Bek, daughter of Oone the Dreamthief and Elric, Sorcerer Emperor of Melnibon?'

Ulric von Bek, now married to Oona, the Daughter of Dreams, has been abducted by a band of spectral natives, while travelling through Canada.

Oona gives chase, en route to the Skrayling Oak which contains all realities, to brave the maelstrom of a mythic America - where malign forces try to pitch her against Elric, an aspect of the Eternal Champion and her father.

Meanwhile, the captured Ulric finds himself once more in the multiverse where finally he is reunited with his alternate self, Elric, and his wife, Oona. There, the three of them must take arms against an impossible enemy, bent on destroying the Skrayling Oak. For if the tree falls, so too does the multiverse ...