Ages 7 and up.
Pearl Petal and Ben Silverstein can't wait for their first official day as apprentices of Dr. Woo, veterinarian for imaginary creatures. That is, until they are tasked with clipping the sasquatch's toenails. Gross!
Then Pearl spots a monster in the lake behind the hospital. Even though they were told not to leave the building for any reason, Pearl sets off for a closer look, with Ben trailing cautiously behind.
The outing goes awry when Ben is captured by the creature and held hostage on an island 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 the town troublemaker? And will the hospital's secret patient be able to help?