Jessi is thrilled when she earns the lead in her dance school's latest ballet, but someone in Jessi's class wants her out of the show.

Dawn is sure there's a ghost in her house and so are the other baby-sitters. But they're so busy with their baby-sitting jobs that they hardly have time for a ghost hunt. Will the mystery ever be solved?

Kristy searches for clues to the disappearance of an heiress from Stoneybrook in 1863.

When Abby comes home from school one day and finds a baby on her front porch, she's completely mystified. Where did he come from? And why was he left on the Stevenson's porch? Abby's mom convinces the authorities to let the baby, whom the family dubs Eli, stay at their house while the search for his parents is conducted.

While Karen is visiting her little-house family in Chicago, there is a robbery in their building. Karen decides to solve the mystery, so she makes a list of suspects, looks for clues, and soon she thinks she knows who the burglar is.

Karen's class is helping to decorate a haunted house for Halloween, and it's fun making things look scary. But then Karen and her friends start hearing spooky noises and find someone is playing tricks on them. Is their haunted house really haunted?