The lesson that this book demonstrates is a completely timeless one, which I'd guess was a big part of the reason why The Blue Cat of Castle Town was one of the Newbery committee's choices to receive a 1950 Newbery Honor citation. The main lesson is an encouragement for every one of us to find our own unique path in life to success and happiness, to ply our personal strengths to the best of our ability to help bring beauty and goodness to the world around us. We all live as part of a community, but that community is an incomplete entity unless everybody pitches in and offers generously of themselves and their abilities to further it. When we work only for ourselves, or cut corners to save money and hard work, it hurts everyone in our community eventually, including ourselves, because we all depend on someone else to provide for us an honest and high-quality product or service.
When the blue cat on whom this story centers is born, his mother instinctively knows that a cat of such rare color is probably destined for a life of greatness. Only a blue cat can hear the song of the river, legend says, and the blue cat's mother tries to keep him away from the alluring song. Destiny is too powerful to be thwarted by the intentions of an overprotective mother, however, and when the blue cat does finally hear the song of the river, he is instructed by its gurgling form to wander Castle Town in search of a human being who might be receptive to the river's song, a person able to learn the song from the blue cat and then spread its positive influence all around town.
What is the song, you might wonder? Its words are an encouragement for people to go their own way and "Sing your own song", to create works of functionality and art with their hands and intellects so as to make their community a richer place to live. There is a different kind of "encouragement" being spread around Castle Town, though, and before the blue cat finishes his quest he surely will run head-on into the miasma of that negative influence, and the man who set it into motion. The blue cat was marked from birth to live a special life, though, and it's up to him to save Castle Town from choking on its own greed and becoming a barren branch worth nothing because it simply stopped producing anything of value.
The weaving together of mysticism and history is nothing new to Newbery, but I have to say that The Blue Cat of Castle Town is a stranger mix than most of the other Newbery books of that vogue. Beneath the oddities of the storyline, though, are some wonderful principles that are as worthy of notice today as they were when this book was first published. I would recommend The Blue Cat of Castle Town as more than just a curiosity for readers interested in experiencing literature from another time period; it is a solid story on its own merits that measures up favorably to most other children's literature of its day, and I'd be agreeable to seeing it come back into print at some point. I would consider giving two and a half stars to The Blue Cat of Castle Town.