Who Stole New Year's Eve? — Martha Freeman

Between Christmas and New Year's Eve, College Springs has a winter carnival, complete with ice sculptures; however, this year someone has stolen all thirty-seven of them, including one on Chickadee Court. Unfortunately, the twelve-year-old sleuths, Yasmeen and Alex, are having friendship issues -- Yasmeen thinks that she's being replaced by a new girl who has come to Chickadee Court. Then, the whole gang comes together to solve the frosty mystery. Believe it or not, the clues lead to a fracking operation and the laboratory of a professor who is racing to invent a new alternative fuel before his competitors do.