Ever since Mattie Waters lost her mother, she's been sharing a trailer with her aunt Molly, the proud owner of Owl's Outstanding Donuts. Mattie loves her aunt and the shop, even if she's still dealing with a life without her mom. But not everybody is a fan of Owl's Outstanding Donuts. When an owl taps on Mattie's window one night, Mattie looks out to see suspicious activity not far from the shop. A shady duo is dumping gloop near the highway. And soon people want to blame Aunt Molly! With help from her friends, Mattie sets out to find the real gloopers. Along the way, she'll face fears that have followed her since her mother's passing-and get to know Alfred, a stuffy, donut-loving owl who's also on the case.