Growly Bear and Mary Rose are very best friends and do everything together. Until one day, Growly Bear is left behind on a train. He's sure that Mary Rose will come back for him. However, as the days turn to weeks and the weeks turn to months, Growly Bear's fur gets worn, his eye comes loose, and his Growl starts to fade. Then, a child picks him up! But it isn't the child he was expecting.