13 year-old Ruby Redfort is amazing at code-cracking. But she is surprised when she receives some weird messages, phone calls, and clues. They turn out to be from a super secret organization, called Spectrum, who needs Ruby to help them solve some clues that a late worker left behind while trying to figure out a case. Mystery and danger soon follow....and soon Ruby finds herself in a bad position.
I loved this book! It is like a Nancy Drew, but more modern and at kid level, because Ruby is a kid of 13. It was a thrill to read, with cliffhangers and always the question: "What will happen next?" There was multiple views from multiple characters, which made it interesting. It was also funny at some parts! Overall, this was an AWESOME book!!