Eternal Rider is the first book in the second story arc of the Demonica series. So, going in, this has a lot of world building to accomplish. I think it really did a great job of getting everyone up to speed on a brand new set of core characters. Don't worry, we still get to see our old friends at UG and they are all very much in on the future adventures / battles to come. 
 Our romantic leads are Cara and Ares (aka: War, The Second Horseman of the Apocalypse.) I genuinely like them as a pairing. I do wish they had spent some more time in developing the relationship a bit more gradually than it went down. It felt a little too... simple. I can say the same thing about Cara's transition into the paranormal world. She starts off in the story as a human with one special ability and then BAM! she's got a pet hellhound and is thrust right into the middle of the apocalypse. She only spends a very minimal amount of time freaking the fuck out so her acceptance of the paranormal world almost seemed too easy. That being said, I actually loved that she got with the program right away instead of just being stupidly stubborn for the sake of a plot device. There's something to be said about hiking up your big girl pants and getting with the program! I ended up really liking Ares as soon as he stopped being Mr. Macho Warlord. I loved the warm cuddly Ares that is kind to baby demons and brings pillows for Cara and gets flustered talking to her. "Adorable" isn't the kind of word people in Demonica would normally use to describe Ares, but he's actually quite adorable. As for the smut... it got real interesting. There was a scene involving hanging upside down from a tree... I"ll just leave that up to everyone's imagination. 
 Now... I will geek out in spoilers: 
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 1.	I kept screaming at Cara to just transfer the Agimortis to Kynan! I mean Hello! He's a charmed human and has a dash of angel blood in him so it more than likely wouldn't even harm him, let alone kill him. He would be a great candidate to host the damn thing. Why did no one even consider it!? 
 2.	Why does her healing ability only work on animals? Her killing ability works on humans so wouldn't it make a lot more sense if the healing part also worked on other humans? It seems like a rather arbitrary plot hole in her abilities. 
 3.	The Darkest Torment by Gena Showalter is a complete rip off of this story! 
 4.	Hal the Hellhound puppy is the best. He likes to chase birds... and eat them. He likes to chase people... and eat them too. But seriously, he's adorable! 
 5.	Battle the Horse is so mischievous. (hide spoiler)]