After returning to his room, Leonard immediately started studying his newly acquired diary. After a simple investigation, he was basically certain there were no hidden compartments or codes in it.
It made sense, as the diary was primarily for venting the author's emotions and would generally not contain any secrets.
For ordinary people, this would be the end of the investigation since, at most, the current evidence could only reveal what kind of person Mr. Carter was.
However, for Leonard, this was just the beginning. Because the diary contained precise dates, Leonard quickly used an [Identification (R)] card on it.
The reason for choosing this card was also very simple: through the dates on the diary, he could quickly judge when Mr. Carter most likely hid the treasure, allowing him to observe around that time.
