It's Walter's birthday and he has big plans for his party. There will be cake and ice cream and horseback riding, and all of his friends will be there--including, of course, his best friend, Iris. But when the big day finally arrives, something unexpected happens. Will the change of plans ruin Walter's birthday?

In the tenth book of the award-winning series, Iris and Walter discover that sometimes an unexpected surprise can make a special day all the more memorable.