Pearl Petal and Ben Silverstein can't wait for their first official day as apprentices to Dr Woo, veterinarian for imaginary creatures. That is, until they are tasked with clipping the bigfoot's big toenails. Gross!

Then Pearl spots a lake monster in the water behind the hospital. Even though they've been told not to leave the building for any reason, Pearl and Ben set off for a closer look.

But when Ben is captured by the creature and held hostage in the middle of the lake, it's up to Pearl to hatch a rescue mission. Will she save the day, or cement her reputation as town troublemaker?

This is book 2 in Imaginary Veterinary .

This book has been graded for interest at 7-9 years.

There are 224 pages in this book. This book was published 2013 by Hachette Children's Group .

Dan Santat is the Caldecott Award winning illustrator of The Adventures of Beekle . He lives in California. Suzanne Selfors is the author of To Catch a Mermaid. She lives with her husband on an island in Washington state where they are raising two children, a dog, a cat, and a flock of messy chickens.