Which innovative book packaging format, introduced in the 1980s, revolutionized the mystery genre by allowing readers to examine physical clues and evidence alongside the narrative?

The publishing industry has seen remarkable innovations in book packaging and presentation over the years. From special collector's editions to innovative marketing strategies, publishers have found creative ways to attract readers and distinguish their products in an increasingly digital marketplace. This trivia question explores a significant packaging innovation that changed how consumers interact with a particular literary genre and created a new market segment.

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Murder Mystery Boxes - containing actual evidence replicas packaged with detective novels
Choose Your Own Adventure - branching narrative books where readers make choices affecting the story outcome
Audio Companion Sets - novels packaged with cassette tapes containing atmospheric sounds and music
Illustrated Detective Series - mystery novels with detailed illustrations revealing hidden clues in the images