Welcome to Camp Zanika. North America's foremost summer camp for twins. Every June, select pairs come from across the United States and Canada to rural Illinois for two months. It has been described as the worst and best time of their lives by some twins who have previously attended Camp Zanika. What most of the campers don't know when they sign up is that Camp Zanika specializes in a research program where they study the physical and emotional connection of twins via secret experimental chemicals slipped into the kids' food.

Now it's time for a new batch of twins to arrive, and only time will tell how long it will take before things get messy between them and they start notice that there's something a little extra in the mystery meat the mess hall serves.