Three Parts Dead
The Craft Sequence - Book #1
by Max Gladstone
Imagine this: magic as legal contracts. Sounds boring, but Gladstone turns this idea into an incredible world.
Kos the Everburning, god of fire, is dead. Cause of death? He ran out of soulstuff due to contractual obligations.
If you enjoy unique magic systems and well-thought out worlds that surround them, you'll enjoy this. I loved it. I really did. So much that I immediately picked up the second. And the third. And the fourth book in the series.