What's an 11-year-old boy to do when an ugly dog called Blacky appears on his bed and tells him he has been given the mission to rescue God? When Marcus is woken by a dog going to the bathroom on his bed, he is understandably upset. And Blacky the dog has other surprises in store. Soon Marcus and his disruptive friend Dylan are on a mission to rescue God—a sick pygmy bearded dragon—from the local pet shop, but time is running out. To complicate things, Marcus' sister Rose is in the picture—she who thrives on terrorizing her little brother. She is the sister from hell, but revenge will be sweet—or so Marcus thinks.