Fourth grade is bringing a lot of surprises for Andy Russell, and not all of them are good. His pet gerbils have just pulled off another great escape, this time right in the middle of the school carnival. While he scrambles to catch his furry runaways, things at home are getting just as chaotic. His good friend Tamika is moving in with his family for a little while, which means sharing his space and his daily routine. On top of that, Andy and his sister Rachel are on a major mission. Their family is expecting a new baby, and the siblings are determined to uncover whether they are getting a new brother or a new sister. Between runaway rodents, a houseguest, and a huge family secret waiting to be solved, Andy has his hands full. Step into a hilarious and heartwarming story about navigating school mishaps and big family changes. You will laugh out loud as Andy tries to keep his wild life under control while figuring out what it means to be a great friend and an even better big brother.