If it's a basic investigation
All the key information about a basic investigation is stored in Investigations. At any time, you can open this section to review the description of the victim, the suspect list, and the identifying marks of the criminal. This section also contains logs of all the dialogues related to the investigation. To reread one of them, just tap Repeat.
If it's an additional investigation
Additional investigations are usually connected to leads that you get from informers. To review the details of an investigation, tap the informer's photo on the city map. This opens a window where you can see all the key facts about the investigation and logs of dialogues with characters.
If it's a special investigation
Special investigations are connected to seasonal events. To review the details of an investigation, tap the event card on the city map. This opens a window where you can see all the key facts about the investigation and logs of dialogues with characters.