Reggie the monster is house-sitting for his cousin Agnes and her family, and his world is turned upside down when he meets their neighbor Emily. At first reluctant to the idea of a friend, Reggie slowly warms up to the outgoing Emily and finds himself having a fun-filled summer.
Despite their differences, monster neighbors Reggie and Emily make the perfect pair of explorers, and with a map to make, a beach party to plan, and a sea monster to find, Reggie will have to learn to talk about his feelings and let new friends in.
