Knight Of Shadows

Description for KNIGHT OF SHADOWS by Roger Zelazny:

The one real world, of which all others-including our Earth--are but shadows...

AMBER

The magnificent epic adventure of magical realms and royal intrigue continues, as Merlin, heir to miraculous powers, is forced to choose a definitive allegiance with either Amber or the Courts of Chaos. And on a dangerous spirit journey--both undesirable and incomprehensible--he must comb the wondrous center of all realities in search of the two most dear to him: Julia--his beloved, once murdered, now reincarnated as his deadliest enemy ... and Prince Corwin -- Merlin's father, mysteriously vanished but tantalizingly near.

This is #9 in Amber Chronicles Series.