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Summary:
Thirteen-year-old Ruby, a genius code-cracker and daring detective, gets an anonymous call setting a challenge that leads her to the headquarters of Spectrum, a highly secret anti-crime agency that needs her help to crack a code, but soon Ruby uncovers dastardly plans of the Fool's Gold Gang.
Notes:
Originally published: London : HarperCollins Children's Books, 2011.
A Junior Library Guild Selection
Description based on print version record.
What is the Rotten Tomatoes Tomatometer?
The Tomatometer measures the percentage of Approved Tomatometer Critics who recommend a certain movie --
or the number of good reviews divided by the total number of reviews.
A good review is denoted by a
FRESH tomato.
A bad review is denoted by a ROTTEN tomato. 
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