Rosie has never actually seen the Pendred's baby. It's always asleep by the time she gets to their house to baby-sit. But one night it starts to snort, then grunt, then howl. When Rosie goes to check it out, she finds that the Pendreds have locked their baby in its room! But not for long, because the little beast is hungry for a nice, fresh baby-sitter. And what baby wants, baby gets!