Bo is a typical dog, he plays with friends, loves sports, and loves to be out and about exploring all day. There is one thing about him though. Bo is considered an extra. There are many other animals and creatures in the world but Bo wasn't planned. When his parents had Bo and his siblings they wanted exactly three puppies. There was four, and Bo was the fourth. He was abandoned, just like any other extras out there. You're probably wondering why there are so many "extras." That is because of a population law. A family is only allowed to have three children. Any others are meant to die, unless the parents want to hide them. If you are a hidden child you become a shadow, you're not an extra anymore, you're a shadow. Bo believes it should be equal for everyone no matter what number child you are. Bo has a great but risky idea in mind, but he needs to find some help first.