Many of Mr. X's diaries describe how he investigated audacious and insidious atrocities. Such stories end with an enigma: Who was the culprit? It's up to you to find the answer!

To begin with, open the diary and tap the Characters bookmark. You’ll see the pages with a detailed description of all the characters of the story. The names of those whom Mr. X himself suspected, will be at the top of the list. There is an Accuse button on their pages.
Read the characters’ descriptions, learn of their motives and resources, and bring an accusation against one of them. If you are mistaken, you’ll receive proof of the character’s innocence.

When you figure out the real criminal, the Guilty stamp will appear in the diary. Justice will be served, and you’ll get the final reward for the investigation!