Michael Moorcock 
Quest for Tanelorn 

Dorian Hawkmoon’s dangerous quests through the multiverse have been successful and he has finally been reunited with his true love Yisselda, although his two children are still missing. Hawkmoon would move Heaven and Earth to find them — no idle boast when dealing with the multiverse — and soon finds himself on another quest. If he is to finally reunite his family, Hawkmoon must first find his way to the fabled city of Tanelorn…