Emmy is just an ordinary girl … who can talk to rats.

She can shrink to the size of a rodent, too.

And just a few weeks ago, she even became a rodent to defeat her evil former nanny, Miss Barmy, and save some little girls from a fate worse than death.

But Emmy’s parents do not know about their daughter’s other life. So when mysterious things start happening that Emmy seems to be lying about, they ship her off to visit two elderly aunts in order to learn responsibility.

Ratty, her rodent friend, comes along to search for his long-lost mother in Schenectady; and other friends of Emmy’s get involved in the search, too.

Little do they know that Miss Barmy, bent on revenge, will follow…