Indigo disappears after being humiliated by Miss Hardbroom again.

Mildred uses a re-animation potion on an old broom to help her sweep up faster – but her thoughtless treatment leads to a broomstick rebellion. Mildred is taken prisoner and only released after helping to fix the brooms – which return the favour and save the day for Indigo in a daring flying display after she looks set to fail her exam.