Robert is an only child who never had to share his toys with anyone. He's never had to worry about someone messing with his stuff or following him around. But when his mother starts watching a kid named Stevie, all of that changes. Now Robert has to share his space, his time, and his parents with Stevie.
Then one day Stevie moves away. Robert thinks that life will finally return to normal, but something else happens. Something Robert never expected: Robert misses Stevie.