This fourth book contains six adventures of the Banks children with Mary Poppins during their outings into the park along Cherry Tree Lane. Chronologically the events in this book occurred during the second or third book (Mary Poppins Comes Back and Mary Poppins Opens the Door respectively). Among the adventures they experience are a tea party with the people who live under the dandelions, a visit to cats on a different planet, and a Halloween dance party with their shadows. Things happen to the Banks children when they go to the park with Mary Poppins. Strange things, funny things, unexpected things: nothing is ever straightforward with Mary Poppins about - and it's never boring either! Mary Poppins, neat and prim in her blue skirt and a new hat trimmed with a crimson tulip, looked at them over her knitting. She was sitting bolt upright against the tree, with a plaid rug spread on the lawn around her. Her handbag sat tidily by her side. And above her, from a flowering branch, the parrot umbrella dangled. She gave a little sniff. The stories in this collection happened during all three of the visits Mary Poppins made to the Banks family. Jane and Michael are never quite sure whether what happens to them in the Park is just a dream - or not; things are never straightforward with Mary Poppins!