The third book in the New York Times bestseller Middle School and Other Disasters series, witch-in-training Heidi Heckelbeck struggles to keep a secret alongside magical mishaps and everyday mayhem at her new boarding school. Featuring black-and-white illustrations and doodles throughout and perfect for fans of Dork Diaries, The Worst Witch and Harper Drew! Heidi is making new friends at Broomsfield Academy--in particular, a popular girl named Isabelle. But it turns out Isabelle has a big secret that Heidi discovers by accident! Heidi promises to keep the secret, but as more time goes by, it becomes more and more difficult...especially with nosy Melanie Maplethorpe snooping around. This secret is huge. Will Heidi be able to keep her promise? Join Heidi and her friends for pranks, potions and magical misahaps in this bestselling series!