The summary is:
The speaker is a YouTuber who claims to have discovered that his friend Douglas was behind a series of mysterious and threatening messages and videos sent to his sister Maria. He explains how he found out that Douglas was using a second phone and his relatives' house to prank them, and how he confronted him on a video call. He also shows some evidence from the cameras and the notes that Douglas left. He says that he suspected Douglas from the beginning, but Maria was scared and confused. He ends by joking that they should have a detective channel.
Here are the key facts extracted from the text:
1. The speaker, Joãozinho, has been receiving threatening messages.
2. The messages were sent by an unknown person who was claiming to be outside Joãozinho's house.
3. The person sent a photo of themselves in front of Joãozinho's house.
4. Joãozinho's sister, Maria, was also involved in the situation.
5. Joãozinho suspected that the person sending the messages was someone close to him, possibly a friend or family member.
6. He investigated the situation and gathered evidence, including video footage and witness statements.
7. Joãozinho discovered that the person sending the messages was likely Douglas, a friend who had been acting suspiciously.
8. Douglas had been using a second phone to send the messages, which he had been hiding from his girlfriend.
9. Joãozinho and Maria had previously suspected that Douglas was involved, but they had ruled him out as a suspect.
10. Joãozinho confronted Douglas about the situation, and Douglas's behavior was suspicious.
11. Joãozinho and Maria have video evidence of Douglas's actions, including footage of him leaving a note at their house.
12. The investigation was ongoing, and Joãozinho was still trying to gather more evidence.
13. Joãozinho's health was poor at the time of the recording, and he had recently been in the hospital.
14. Joãozinho's arm was also injured, but the nature of the injury is not specified.
15. The situation was causing stress and anxiety for Joãozinho and his family.
Note that some of the text is difficult to understand due to the conversational tone and the use of colloquial expressions.