The Hundred Thousand Kingdoms by N.K. Jemisin

This is the first volume in the Inheritance Trilogy.  Yeine, a nineteen year old teen and leader of her small country in the backwoods, is called to the capital of the Arameri kingdom, Sky.  The Arameri family rules over all the world, under the auspices of the Sun God.  The current ruler, Dekarta Arameri, Yeine's grandfather, is old and has called together his heirs to conduct the ceremony to transfer the kingdom to one of them.  Of course our young Yeine steps into a cesspool of intrigue around which of Dekarta's heirs will be named King.  She soon finds that the Arameri not only rule over the kingdom's citizens, but have command over several major gods who were the losers in a war with the Sun God.  These Enefadeh are forced to obey the orders of the Arameri.  The Enefadeh soon involve Yeine in their plot to become free of the Arameri rule during the inheritance ceremony.  Of course everyone is trying to use Yeine as their pawn, but she has plans of her own.  Jemisin has built a convincing world for this fantasy, with good plot twists and surprises. 388 pages.