Aww, I loved Dark Instincts, the 4th book of The Phoenix Pack series! It was great from beginning to end ....especially the ending... and I didn't want to stop reading it for anything. 
 Dark Instincts was centered around Marcus, a Phoenix Pack enforcer, and Roni, an enforcer for the Mercury Pack and sister to Mercury's alpha. I loved them together. Their story was unique and captivating. As usual, we got to see the other Phoenix Pack members and learn more about the newer Mercury Pack members. I really love how there is a seamless transition from book to book and the story lines easily carry through. 
 I give Dark Instincts 5 stars. It was well written, engaging, suspenseful, and hot. 
 This series is fantastic and I'm bummed that I now have to wait for book 5 to be released. I want to keep reading more about my favorite pack members and I hate waiting.