The magical colored pencils come in a box that has a very clear warning: "Do not draw dangerous or mischievous animals". But Henry can't read yet. Before anyone can stop him, he draws six mice that are slightly misshapen, along with a hedgehog. And then they come to life, reaping havoc in the playroom. How Henry draws himself into -- and out of -- this artistic pickle makes for a riotously illustrated and drolly told adventure in creativity.