Bad Blood (Book #4 of the Blood Coven series) by Mari Mancusi

Just when things have begun looking up for twin sisters Sunny and Rayne, being involved with vampires takes another life threatening turn. Sunny's boyfriend, head vampire of the Blood Coven, Magnus, has been ordered to take a blood mate. Hand-picked for him is gorgeous Oxford graduate, Jane. Sunny is saddened by this, but Magnus assures her that Jane will be nothing but a second in command. Prepared to just accept this new twist in her relationship, Sunny begin to grows suspicious of Jane. Together her and her sister Rayne travel to Las Vegas to investigate Jane and stop the blood ceremony that could lead to the downfall of the Coven...

I really enjoyed this book. It was full of twists and I loved the character development of both Sunny and Rayne. Although you don't have to have read the first three books to understand or enjoy this installment, I highly recommend the series as a whole.

-Sam