The Super-Secret Science Club: The Secrets of Rosalind | S. C. Davis
In the second book of the series, Jenna and the other members of the Super-Secret Science Club are ready to take on the Rosalind Group, the evil organization behind the kidnapping of not only a renowned scientist, but the students' own teacher as well; the very one that recruited them as spies. But Jenna messes up, and loses the trust of her team.