<P> 9 . Kristy and the Haunted Mansion (June 1993) - Kristy and her softball team get caught in a storm and spend a night in a haunted mansion . </P> <P> 10 . Stacey and the Mystery Money (August 1993) - There's counterfeiting going on in Stoneybrook and, when Stacey ends up accidentally paying someone fake money, the Baby - Sitters Club have to clear her name . </P> <P> 11 . Claudia and the Mystery at the Museum (November 1993) - Claudia is visiting Stoneybrook's new museum when several thefts occur . Claudia has to find the culprit and save the museum . </P> <P> 12 . Dawn and the Surfer Ghost (December 1993) - Strange things are happening when Dawn sees a ghost off the California coast . </P>

How many baby sitters club books are there