Lost and Found
A penguin turns up on a boy's doorstep, looking sad. Thinking it must be lost, the boy takes the penguin back to the South Pole - only to realise that it wasn't lost, it was lonely. In few words, and with much humour, this book beautifully conveys the moment the boy realises what the penguin is actually feeling - and that realisation opens up a heartfelt reunion of two friends. We get to witness the boy's emerging ability to empathise, and we see what a difference that it makes.
The book has been adapted into a gripping and poetic film - I recommend it just as highly.