The Baby-Sitters Club Wiki
The Baby-Sitters Club Wiki

Kristy and the Middle School Vandal is the 25th book in The Baby-Sitters Club Mystery series.

Back Cover Summary[]

It all started with a simple prank, which Kristy thinks is the work of Cary Retlin. Cary denies it, but offers Kristy a challenge: The BSC has six days to solve eight of Cary's puzzle-like clues. If they succeed, Cary will stop his tricks. If they fail...well, Kristy hates to fail.

In the middle of the contest, SMS is hit with some real vandalism. Has Cary changed the rules, or has someone else — whose motives have nothing to do with fun — joined the game?



The BSC hosts a scavenger hunt for the clients.

Characters in this book[]

Kristy's Family

BSC Members




Places in this book[]

Pop Culture and Real-Life References[]

  • Life Magazine and Life cereal on page 71
  • The Sound of Music on page 47.
  • Nancy Drew

Continuity and Inconsistencies[]



  • Abby comments that their bus is always on time or early on the way to school and is only ever late on the way home, but then later her bus is running late on the way to school.
  • Logan is described as having brown hair on page 33 instead of blond or blondish brown.


  • The working title of this book was Kristy and the Mystery War[1].
  • Cary's clues take the BSC to the gym, the boiler room, supply shed, biology classroom, the Express room, auditorium,
  • The teachers at SMS might be going on a strike.
  • This is the first time Kristy is mentioned to be wearing a watch.
  • This is the only book without a line on the cover about the book.
  • Mary Anne mentions Dawn in this book but she is not seen or heard.
  • Some members of the BSC went to the board of education meeting.
  • Sarah Karush is the president of the board of education.
  • Mrs. Martinez doesn't really call the BSC much anymore, Kristy calls her a one time client.
  • Kristy thinks Abby has a weird sense of humor sometimes.
  • Adam Pike has been watching a lot of bad movies lately.
  • The Brewers subscribe to the New York Times.
  • Abby helped fill out her school transfer paperwork.
  • Despite not being there when it happened, Cary knows about Claudia's personals column.
  • Claudia gave her mom homemade wind chimes for Mother's Day.
Mystery Books
#1 Stacey and the Missing Ring | #2 Beware, Dawn! | #3 Mallory and the Ghost Cat | #4 Kristy and the Missing Child | #5 Mary Anne and the Secret in the Attic | #6 The Mystery at Claudia's House | #7 Dawn and the Disappearing Dogs | #8 Jessi and the Jewel Thieves | #9 Kristy and the Haunted Mansion | #10 Stacey and the Mystery Money | #11 Claudia and the Mystery at the Museum | #12 Dawn and the Surfer Ghost | #13 Mary Anne and the Library Mystery | #14 Stacey and the Mystery at the Mall | #15 Kristy and the Vampires | #16 Claudia and the Clue in the Photograph | #17 Dawn and the Halloween Mystery | #18 Stacey and the Mystery at the Empty House | #19 Kristy and the Missing Fortune | #20 Mary Anne and the Zoo Mystery | #21 Claudia and the Recipe for Danger | #22 Stacey and the Haunted Masquerade | #23 Abby and the Secret Society | #24 Mary Anne and the Silent Witness | #25 Kristy and the Middle School Vandal | #26 Dawn Schafer, Undercover Baby-sitter | #27 Claudia and the Lighthouse Ghost | #28 Abby and the Mystery Baby | #29 Stacey and the Fashion Victim | #30 Kristy and the Mystery Train | #31 Mary Anne and the Music Box Secret | #32 Claudia and the Mystery in the Painting | #33 Stacey and the Stolen Hearts | #34 Mary Anne and the Haunted Bookstore | #35 Abby and the Notorious Neighbor | #36 Kristy and the Cat Burglar
Super Mysteries
#1 Baby-sitters' Haunted House | #2 Baby-sitters Beware | #3 Baby-sitters' Fright Night | #4 Baby-sitters' Christmas Chiller
Other Series
Baby-Sitters Club | Super Special | Portrait Collection | Readers' Request | Baby-sitters Club: Friends Forever | California Diaries | Baby-Sitters Little Sister | The Kids in Ms. Colman's Class