CONKERBURY DETECTIVESDETECTIVE PUZZLE CLUB
The book: The Case of the Missing Conker Champion by Inspector Cuthbert Conkerworth. 30 solvable mystery cases for detectives aged 8 to 12, set across one very British school year. About the book Coming soon on Amazon

The secret bonus case

This case isn't in the book. It's only here, behind a lock.

LOCKED FILE

Crack Case 8 to get the secret key. (It's printed at the bottom of the Case 8 solution, too.)