The Secret of the Forest is the follow-up to Book 1: How to Make Friends in Space. It follows the continuing adventures of a little boy named Leo and his robotic best friend Tony. They travel through space in a spaceship named Prudence with Leo's dad, who is the only other human on board a ship full of 'bots. The ship is also home to a living forest, supplying them with food and air during their long journey through space. The story picks up on a visit to a distant planet named Kepler-22b. Unfortunately for Tony, he is separated from his ship and Leo will be forced to make a decision- either save Tony or cripple Prudence! In the process, Leo will have to come face to face with the secret of the forest. Nothing will ever be the same for Leo after this exciting adventure!