The Amazing Life of Azaleah Lane by Nikki Shannon Smith, illustrated by Mari Lobo

Azaleah can't wait for her class field trip to the National Zoo in Washington D.C., especially when her teacher announces the chance to earn extra credit. But when Azaleah gets home, she quickly realizes extra credit isn't as easy as she thought. Azaleah's younger sister Tiana can't find Greenie, her stuffed animal, and she's sure he's been stolen. With Mama at the restaurant and Daddy at work on a big case, it seems Azaleah is the only one available to track down the stolen stuffie. Can Azaleah get to the bottom of the mystery in time to finish her extra credit?