Pearl and her trusty rust-proof robot, Pascal, need to build a sandcastle before summer vacation is over, and they're going to do it using code. Pearl breaks the big we-need-a-sandcastle problem into smaller steps, then uses conditionals, loops, and other basic coding concepts to tell Pascal exactly what to do. But building a sandcastle isn't as easy as it sounds when surfboards, mischievous dogs, and coding mishaps get in the way. Just when it looks like the sandcastle might never work, Pearl uses her coding skills to save the day and create something even better: a gorgeous sandcastle kingdom.