Cary Retlin is a minor character in the series. He is in eighth grade at Stoneybrook Middle School and is enemies with Kristy and the BSC.
He has blond hair and blue eyes. The clothes he wears are always baggy.
He first appears in Mystery #22 Stacey and the Haunted Masquerade. In that book, for Halloween he dresses up like a knight.
He has two brothers, Stieg and Benson, who are 8 and 11.
He is the enemy of the BSC because he is the champion of breaking into lockers, mysteries, and pranks. He stole Kristy's watch and raised her homework answers, but never anything serious. He may or may not be the Mischief Knight. In mystery 25 Kristy and the Middle School Vandal, he gave the BSC a challenge: they need to find eight of his clues in six days in order for him to stop his tricks. Kristy ends up accusing him of being the middle school vandal, but she is mistaken. They end up giving up the mystery war so he can break into Troy's locker.
In book 122 Kristy in Charge, he and Kristy were forced to be partners in gym, for an assignment. They end up going on teams, arguing, and as a result, other players get hurt. They agree to separate their differences for the kids.
- Mystery #22 Stacey and the Haunted Masquerade
- Mystery #25 Kristy and the Middle School Vandal
- Mystery #33 Stacey and the Stolen Hearts
- Book #122 Kristy in Charge
- Super Mystery #3 Baby-sitters' Fright Night
- Friends Forever #5 Kristy Power!
- Friends Forever #8 Mary Anne's Revenge