When a bruised and underweight Cammie wakes up in a convent in the Alps, she has no idea how she got there, but quickly finds out that her entire summer is gone-- and she can't remember it. She knows she ran away after Joe Solomon almost died, but doesn't know where she went or what she did. This is a problem, since the Circle of Cavan may or may not have taken her at some point and extracted information from her. Her mother and friends are glad to have her back, and Zach is now living at Gallagher Academy to keep him safe from his evil mother, but Cammie is having a hard time readjusting. She frequently blacks out due to her multiple head injuries, and occasionally shows some mad assassin skills that she didn't have previously! She and her friends try to figure out what happened, and whether or not the circle is still trying to kill her. Their research takes them to Italy, where it turns out Cammie made some startling discoveries. Can she follow all of the threads and get the answers that she needs... and still stay alive?
Hard to write a review of this AWESOME book without giving too much away, but it was even better than the first four! The details of spying make me think that either the author is really good at research or has a background that she isn't telling us about. I love how supportive her friends are, how her mother and aunt are worried but not overly in her face, and how Zach doesn't doubt Cammie's abilities but checks up on her none the less. Also, the girl on the cover is not a stick. Hooray.