Rainbow Girls: Let's Save Lulu! (Rainbow Girls #1)

When middle school friends Mel, Lisa, and Gwen, along with a pet rat named Razzie, go looking for Gwen's missing older sister, they find themselves in a greenhouse with giant carnivorous plants, a mad scientist with an evil plan, menacing thugs, and... newly developed superpowers that they mysteriously develop just in time to save the day (and their own butts)!