It is a book about Pete and Polly and their dog pippin the poodle. “It was a very hot day, I am tired of playing in this garden” sighed Pete, so am I agreed Polly, “I wish we could think of something to do” “Let’s go for a walk” sighed Pete “You promised you’d show me where the twisty path goes to” They ended up getting a key from a fish. A message was attached.. “this magic key will unlock the blue door, and that leads to Magic land, you can ride in the little red car, wherever it likes to take you. But bring back the key tomorrow without fail, or something dreadful will happen!” They rode in the car and met the three bears and a princess who had a lemonade fountain I think. The illustrations were very colourful. I Have been quoting this book to my children for years now 🙂 Would be something wonderful to find it.