Publisher's WeeklyPublishers Weekly reviews King of Shards and has nice things to sayThey write:

“…a robustly imagined fantasy world…Kressel advances his plot briskly through a series of alliances, betrayals, separations, and reunions, and the veiled motives of several of his characters keep his story pleasingly unpredictable. His skill at extrapolating traditional religious lore into the stuff of fantasy bodes well for future books in the series.” 

You can read the full review here.