I'm a huge fan of Toni Aleo's Assassins Series, and Blue Lines made me love it even more! I loved the characters, the story, and the ending was just perfect! :D 
 One of the things I love most about the Assassins series is seeing all of the characters' lives interact, and I think it's awesome that we get to see the main characters from the previous books pop up in the newer ones. :D I also love that with Erik and Piper, we know them already! Piper appears quite a bit in the previous books and while we don't know Erik as well, we've seen him before, too, and I love that we finally get to read their story in Blue Lines! 
 I have to admit that my favourite part of Blue Lines was Piper herself. I loved her. She's just so unique and I love that she's always willing to go for her dreams, even if no one else believes she can accomplish them, she knows she can and that's what really matters. I really grew to love Erik, too. At first I just thought he was sexy...and that he was a total douche-bucket, but the more I got to know him, the more I understood why he acted the way he did, and I actually sympathized with him a lot. Sure, I still totally wanted to shake some sense into him, but I did understand him. I absolutely loved that Toni Aleo made Erik's actions so understandable. Even Piper made mistakes, but again, it was really easy to see where she was coming from. The characters were flawed, but were still easy to relate to. They just felt so real to me and I really loved that. 
 I've loved all of the characters in this series (especially Shea...I still love that guy so fricken much! :D), but I think that Piper and Erik are my favourite pairing so far. They compliment each other really well, and I think they make each other better people. They help each other grow so much and I just loved that. I also loved their chemistry and sexual tension! ;D 
 Overall, I loved Blue Lines! I loved seeing Piper and Erik get closer together, seeing them work together on each others' issues, and just getting to see their relationship evolve. Blue Lines was an amazing story, and I had a huge smile on my face once I finished...such a wonderful ending! Now that I've read Blue Lines, I also have a huge urge to reread the entire series, and I absolutely cannot wait for more from Toni Aleo!!! She's one of my favourite sports romance authors, and if you haven't tried one of her books yet, you seriously NEED to!