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.

Code-cracking girl detective Ruby Redfort must cope not only with sighghtings of mysterious wild animals, rumors of an exclusive perfume formula, and wilderness survival training, but then some priceless jewelry turns up missing.