I would recommend reading book one first as several characters carry over, but it isn't necessary to have read it to follow the main romance in book two. Total side note - I love how the two covers look next to each other.

Book two of the Immortal Heart series is just as exciting and fun as the first. Kenzie is a fiesty little blood tiger that lives with her family separate from any gens (a group/pack of blood tigers). She's an amazing character - full of spice and not afraid to go head to head with the boys. She was so much fun. On the other hand, Joshua is far far too serious - but he's also really old and lonely. They were a very interesting match and it led to a lot of great word play between the two.

Joshua meets Kenzie when he is sent out to investigate an entire gens that has disappeared. It looks to be done by some of the same baddies we meet in book one. The first part of the book really focuses primarily on Kenzie and Joshua's relationship, but the second have really pulls in the action that vampire vs tiger-shifter can have. There are a few surprises in this one as not everyone's loyalty is where it seems at first, but that just keeps things more interesting.

The ending was just a tad drawn out for me. I would have liked to see them get out of the mountains and into the action again a little sooner, although the addition of a new type of character was very interesting to read about. Book three is supposed to be out any day now, and I hope I can get my hands on it soon.