Polly loves words, writing, and telling stories, so when she finds a fancy book on her doorstep labeled "Special Delivery from the Writing and Spelling Department for Polly Diamond" she is thrilled; and when she finds that anything she writes in it actually happens she is really excited--but Polly soon realizes that she has to be very careful what she writes because that kind of power can be dangerous.

Meri wants to share her magic mirror with her friends, so she has invited her whole reading group to a party--but when nobody else can see Mary Lennox from The secret garden in her mirror she has to lie and say she was making it up.

Sean, one of the twins, has a reputation as a prankster, but Meri is convinced that the culprits behind the smashed brownies are Gina and Megan, class bullies--so she turns to Dorothy of Oz in her magic mirror for advice on how to confront them.