I read this on the fiftieth anniversary of publication—although what I really wanted to do was listen to the audio edition read by Joan's daughter, Lizza. But I didn't have that to hand, so the book had to suffice. Which of course it did. It is a ton of fun! Bonnie's parents, Lord and Lady Willoughby, go off on a rest cure for Lady W. leaving Bonnie and her cousin Sylvie under the eye of a new governess, Ms. Slighcarp. Who is as is described. Soon Bonnie and Sylvie escape and have a series of adventures across England until they can right the wrong done to their family.It's hard not to just write a big plot spoilery summary of the plot, but they are so rich and enjoyable that I don't want to spoil them for any readers lucky enough to be coming to the book for the first time. I read this book as a kid so only parts here and there were familiar. Recommended for readers of all ages.