Joyce and Nathan work at the city zoo. Their work is definitely one of the more interesting ones. There, problems occur that are much different from those that people usually face. We deal with humans every day, but they deal with animals, and there are different rules of the game here, aren't there? Joyce and Nathan face a new challenge every day, and today, they are facing a big problem. Namely, something strange happened in the section where the reptiles are kept. They check all the animals every day, and today, several poisonous snakes were not in their habitats. This is a really serious situation, and our heroes have to react really fast and take matters into their own hands.