I first read this book when I was in elementary school, which was a longer time ago then I would like to think about! Upon re-reading it, I found it just as delightful now as it was then.
The story concerns two cousins, one who lives in poverty and the other in great wealth. The poor cousin, named Sylvia, journeys to meet her wealthy cousin, named Bonnie, and they become very close very quickly. They then undergo a series of trials and hardships together, but I don't want to give away too much, so I won't go into detail.
The real beauty of this book is Joan Aiken wonderful ability to describe just enough to delight, and allow your imagination to fill in all of the details. Some authors tell you too much, others too little, Joan gets it just right. I really felt like in reading this book, I was reunited with long lost friends.