Fred is a sixth-grader grieving over the loss of Casey, his beloved dog. Every day he walks home from school bouncing Casey's old worn-out ball. One day, the ball falls down a grate. When Fred tries to retrieve it he enters a parallel world: Casey is alive, his mom, sister, and there's a version of Fred too. Spending time with Casey, Fred feels happy for the first time since his dog's death, but he slowly realizes that the loss of Casey is masking...