From critically acclaimed and prolific author Jane Yolen comes a delightfully funny Level 2 Ready-to-Read story that puts a twist on a classic a knock-knock joke!

Knock, knock...
Who’s there?
It’s Interrupting Cow.
Interrupting Cow wh—!

Well, you know how the joke goes…or do you? Read this side-splitting book to discover the true, surprisingly heartwarming story of the one and only Interrupting Cow!