The Code Busters Club series by Penny Warner consists of 12 books, published between 2011 and 2025. The series begins with The Secret of the Skeleton Key.
The Code Busters Club Non-Fiction series by Penny Warner consists of 1 book, starting in 2015. The series begins with Top Secret Code Busters Club Handbook.
The Connor Westphal series by Penny Warner consists of 7 books, published between 1997 and 2012. The series begins with Dead Body Language.
The Food Festival Mystery series by Penny Warner consists of 3 books, published between 2014 and 2016. The series begins with Death of a Crabby Cook.
The Haunted Dead and Breakfast series by Penny Warner consists of 1 book, starting in 2025. The series begins with Murder at Blackwood Inn.
The Party-Planning Mysteries series by Penny Warner consists of 5 books, published between 2010 and 2012. The series begins with How to Host a Killer Party.
The Troop 13 Mysteries series by Penny Warner consists of 2 books, starting in 2001. The series begins with The Mystery of the Missing Mustangs.