This series makes for quick reading. I enjoyed this book more than the last one simply because the characters in this book (the male and female leads anyway) weren't as colossally stupid as the ones in book 1. 
 Shade is a demon, Runa is a werewolf. Shade's brother is insane. Shade will fade into transparency for all eternity if he falls in love, so of course Shade's brother Roag tricks him into a mating ritual with Runa and he eventually starts falling for her. 
 There was some easy to spot plot points here where the foreshadowing could have been murkier (because I don't always like knowing what's coming), but overall, it was well done. I really liked the interplay between Runa and Shade, as both were written as strong characters, and the ending was very satisfying. As with the first book, there's a crumb of the central mystery that's teased out here as well, but we still don't know what's going on, so of course that increases the chances that the next book will get read. 
 Beach reading, a decent amount of sex, good characters.