In this the third book in the series, Josh has no alternative but to take nine-year-old Angelica (hooligan in ankle socks) to the zoo. When catastrophe and mayhem gets them thrown out, he hopes that's the last he'll see of her for a long while. Then, Aunt E asks Ellingham to rid her of a tiresome guest, but when his efforts only seem to make things worse, she decides to take matters into her own hands. This involves inviting Angelica to stay, despite Josh's dire warnings of disaster. Needless to say it all turns nasty for poor old Josh, and this time Ellingham appears to have lost the plot.