Did you ever read those books in which you read a detective investigating a case but YOU had to find out who the culprit was/what actually happened? They were good, sometimes frustrating, but good. The clues were presented very subtly and objectiely, there were no thoughts from the detective leading/misleading you, it was all up to you.

I started wondering if there would be a manga like this, it would be awesome since there's more challenge in absorbing details from images, I think. There should be no detective's thoughts (or better yet, drawn from the reader's perspective), no "obvious clue!" shots and of course all necessary information must be there for us.

Thank you.

Paradox Blue plays out like this. There is even a feather drawn in each panel that contains a clue.

Detective oriented mangas like..
Detective Conan
Majin Tantei Nougami Neuro
Tantei Gakuen Q -- Quite good

Island..lots of mystery that the mangaka left hints for you to figure out the real culprit.
Pretty much the whole Kindaichi series:

Kindaichi Shounen no Jikenbo - Tanpenshuu
Kindaichi Shounen no Jikenbo - Chidamari no Ma Satsujin Jiken Fudou Koukou Gakuensai Satsujin Jiken

Scanslated:
The New Kindaichi Detective Files
Kindaichi Shounen no Jikenbo: Vanpaia Densetsu Satsujin Jiken
Kindaichi Shounen no Jikenbo

My personal favourite:
Psychometer Eiji


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Rape is imminent.