Short and minor Zelazny.
An ok science fantasy novel is about what this is.
A world with a bit of a star problem, as one side is always light - the science part, and one always dark, the shadow part.
The protagonist is an immortal antihero who talks to his own disembodied soul, and even goes all soliloquoy at one point :
""I am Jack of Shadows!" he cried out. "Lord of Shadow Guard! I am Shadowjack, the thief who walks in silence and in shadows! I was beheaded in Igles and rose again from the Dung Pits of Glyve. I drank the blood of a vampire and ate a stone. I am the breaker of the Compact. I am he who forged a name in the Red Book of Ells. I am the prisoner in the jewel. I duped the Lord of High Dudgeon once, and I will return for vengeance upon him. I am the enemy of my enemies. Come take me, filth, if you love the Lord of Bats or despise me, for I have named myself Jack of Shadows!"
Obviously Jack of Shadows will do some adventuring and end up in the Light Side, etc.
Still, it is Zelazny, so for a short cheesy book of this type, not too bad.
3 out of 5