It's a rainy day, which is good news for Peg and Cat, who can't wait to get outside to splash in the puddles. With their rain boots, raincoats, and umbrellas, they're all set for the puddles in the park. Peg jumps right in, but Cat isn't so sure. Just how deep is that water, anyway? If only they had some way to measure how far down the puddles go! A clever idea from Peg might just hold the solution to Cat's puddle problem in this engaging story, which comes with bonus stickers.