The tree house whisks Jack and Annie away to the misty, lush rainforests of Africa, specifically to Rwanda, where they encounter a group of magnificent, rare mountain gorillas. They meet a kind gorilla researcher who teaches them the proper way to interact with the gentle giants. They must find a way to help the endangered animals and learn about their complex family dynamics and communication, all while navigating the dense jungle terrain. The trip involves a close encounter with a massive silverback gorilla, testing the siblings' bravery. They must find a way to help the endangered animals and learn about their family dynamics, relying on the help of a researcher to observe the animals without scaring them. This adventure teaches them about empathy and wildlife protection.