Hot And Cold

Book 1 in the EJ12 Girl Hero series.
"The heat is on as someone seems to be melting the polar ice cap. Special Agent EJ12 needs to crack the codes and keep her cool to put the evil-doer's plan back on ice. That's the easy part.
As EJ12, Emma Jacks can do anything. So why can't she handle the school Ice Queen of Mean, Nema? Perhaps she can after all."