Pick Up the Pieces - Tinnean
Parts of this book were difficult to read and my heart broke for the young Theo, but I loved the story. You can definitely enjoy this book without reading the Spy v. Spook series, but reading those books first adds so much more to this one. I especially loved seeing Mark and their shared experiences through Theo’s POV.

See the entire review at The Novel Approach: http://thenovelapproachreviews.com/2014/04/08/pick-up-the-pieces-by-tinnean/