I love reading spy stories about teenagers because there's just something so fun and thrilling about them. I thoroughly enjoyed Ringmaster, was satisfied with Empty Quarter, but kind of just waded through Deadlock. It might have to do with the fact that I'm reading this book years after I started the series and now read with a more mature and critical eye but everything felt quite unrealistic. That's not to say I didn't enjoy it-I did. Darcie is a resourceful, mature, and realistic character. However, the plot was a little bit crazy, what with a hostage situation, multiple fake-out deaths, nuclear warheads, etc. If you suspend your disbelief, this is a quick, easy, and enjoyable read. I only wish we had more character development regarding Hugo and his relationship with Darcie. Since I read Ringmaster many years ago, I completely forgot about his character so I was going off everything about him in this book. I would have appreciated more interaction between him and Darcie or a deeper exploration of his past as well as his mental health since I think he might be suffering from a mental illness??? I'm not sure and I would have liked seeing more of him as well as more interaction between Hugo and Darcie and them coming to terms with their past. Finally, this book left off on such a huge cliffhanger??? Is there going to be a next book??? Even though I feel I may have outgrown this series, I still remember the first book very fondly and would love to read what happens next.