notices outside her window Miss Hardbroom standing in the playground surrounded by hazy purple smoke. Thinking she is in a state of shock, Mildred tries to douse her in freezing cold water but the bucket slips off her broomstick and lands with a clang on Miss Hardbroom's head. After witnessing the incident, Ethel Hallow confronts Mildred at lunchtime, saying that the girl she told the frog story to was her younger sister, Sybil. After much provocation, Mildred loses her temper and insults Ethel's family ("All you Hallows are weeds, weeds, weeds!"). After an unfortunate flying lesson, where Tabby makes another terrified attempt to avoid sitting on the end of the broomstick, Miss Hardbroom sends Mildred to her room to calm down. When sitting in her bed, however, Mildred accidentally falls asleep and does not hear Ethel creeping into her room. Mildred is awoken by her bedroom door shutting, only to find that everything looks giant-sized, even Tabby. Peeking in the mirror, she finds that somebody has turned her into a frog. When jumping onto her bed, the frog-Mildred notices a tatty handful of weeds on her pillow, no doubt left by Ethel as a reference to her family's insult and why she turned her into the frog. Panicking, Mildred squeezes under the gap under her bedroom door and hops off to a potions lesson, where everyone has noticed her disappearance. Miss Hardbroom, however, discovers her and puts her in a jar. During the lesson, Mildred manages to escape from the jar and hops over to Ethel's desk, where she drinks an invisibility potion. Taking advantage of her invisibility, the frog-Mildred hops out of the academy and lands in the lily pond on the castle grounds. There, Mildred meets another frog who also was once a human, called Algernon Rowan-Webb (though he has been a frog for so long he can barely remember his surname). Algernon reveals that, rather like Mildred, he was turned into a frog by a fellow magician after an argument, and can only be turned back into a human by another magician. Algernon also reveals that the one thing he craves is to have a proper humans' tea again, with buttered toast and crumpets with honey. Promising to return for him, Mildred hops back up to the academy. Maud and Enid, who have been worrying about their friends' disappearance, suddenly realise what has happened when Tabby shows