Ms. Angela B. has invented a new game. Eager to show it off, she brings it to her local crossword puzzle enthusiasts’ club. However, the prototype is stolen soon afterwards, and she begins to suspect her fellow club members of foul play. She sets about gathering evidence…only to disappear herself.

This Mysterious Case contains lots of code breaking puzzles (don’t we all have a never-ending secret desire to play with decoder wheels?) and a winding plot with a cadre of secretive characters. It’s up to you to find out who stole the prototype, and the location of its inventor!