When Pinky's dad must go away to New Mexico on a business trip, the whole family tags along and makes it a vacation. As a child, Mr. Frink enjoyed exploring caves and caverns, and now he wants to share a spelunking experience with his daughter, Pinky. Pinky learns about cave formations, including stalactites and stalagmites, and about the bats who frequently live in caves. Factual information about Carlsbad Caverns appears throughout the adorable rhyming storyline. The book follows Pinky and her dad as their father-daughter outing progresses throughout their exploration of the caves at the national park.