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

The Mystery at Claudia's House is the sixth book in the Baby-sitters Club Mystery series.

Back Cover[]

Something odd is going on at the Kishis'. First Claudia's room is ransacked. Then she discovers some of her things missing. What would someone want with Claudia's old stuff?

Weird things have been happening with Claudia's sister Janine, too. Janine has been getting suspicious packages in the mail, and she even got caught lying to their parents!

Claudia doesn't know what's going on at her house. But things are going to change with the Baby-sitters on the case!


When Claudia comes from a sitting job one day, she notices her bedroom closet is open, her makeup is re-arranged and the papers on the desk have been moved. At first, Claudia thinks that she's been robbed, but the rest of the house appears normal and nothing is missing, but Claudia wonders who could've been in her room.

One morning, Janine comes downstairs for breakfast late because she was putting on makeup and comes home late for dinner a few times. She also wants to borrow Claudia's favorite red sweater. Claudia catches Janine coming out of her bedroom & she finds things rearranged again. Claudia wonders why Janine is so interested in clothes & makeup all of a sudden.

When Claudia tells the rest of the BSC about Janine's unusual behavior, Mallory thinks that Janine might have a boyfriend. One day, Claudia follows Janine over to Stoneybrook High School (while babysitting Derek Masters who is back in Stoneybrook for awhile) and watch her meet a very cute guy.

Janine continues to lie about her whereabouts, so Claudia, Derek, and Todd come up with another plan to get Janine to confess; they pretend that Derek has to set up a fake courtroom for school and they need Janine's help with the legal stuff. They talk about how important the truth is when Derek confesses that he is supposed to kiss a girl on his TV show, but he has never kissed a girl before & told all of his friends that he had.

One afternoon, Claudia follows Janine again and sees her get in the car with the cute guy from the high school. Claudia gets concerned especially when she hears Janine lie to her parents about where she was that afternoon.

Thinking that Janine might be in trouble, she tells her parents who call a family meeting. Janine confesses that the guy she was with was her boyfriend. She was lying because she wanted to keep him to herself for a while. Janine is mad at Claudia for telling, but they later make up after Janine's boyfriend, Jerry Michaels comes over to the Kishi house for dinner.


Derek is back in Stoneybrook while his show is on hiatus. In an upcoming episode, his character has a bit of romance with a character named Jennifer. Derek is nervous because his character (Waldo) and Jennifer kiss on the show. But toward the end of the book, Derek’s agent says the writers canceled the kiss because they think Waldo is too young.

Characters in this book[]

Claudia's Family

BSC Members



Places in this book[]

Pop Culture and Real Life References[]

  • Muscle Beach
  • California
  • Teenage Mutant Ninja Turtles
  • Seventeen magazine

Continuity and Inconsistencies[]



  • Claudia says she has to catch a bus, but in every other book, she walks to school.


  • Mr. Kishi golfs and likes to mow the lawn.
  • Janine takes the school bus.
  • The library's budget was cut recently.
  • Janine has a Dutch-boy haircut and never really considered contacts.
  • Claudia gives Janine a makeover.
  • Stoneybrook Elementary School gives lots of homework according to Derek.
  • The Pike's invented a game called Crazy Olympics.
  • Janine gets grounded for the first time.
  • Mrs. Braddock, Haley, and Matt learn how to make bread together.
  • Janine is noted to be good with Derek.
  • Claudia has to be reminded to do her chores.
  • The book is set to to be re-released April 2023.[1]
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