On March 27, 2017, Bruno de Melo Silva Borges, a Brazilian student, disappeared after leaving his home in Rio Branco, Acre. In his bedroom, Borges left several encrypted messages, 14 handwritten books, and a statue of philosopher Giordano Bruno. The Civil Police of Acre investigated the case and Interpol was called. Borges's disappearance received wide coverage on the Internet, generating memes and online investigations. During the investigation, it was revealed Borges had the help of two friends and a cousin to carry out the project, and that he had signed a contract allocating part of the proceeds of the sale of his books to his three helpers.
At dawn on August 11 the same year, Borges returned to his house barefoot, debilitated, and dehydrated. Soon after, he began working on corrections for his book TAC – Teoria da Absorção do Conhecimento (lit. Knowledge Absorption Theory), which had received negative reviews. Borges told police chief Alcino Júnior he "disappeared of his own free will and that he was not coerced by any external force".[1] He did not reveal his hiding place. By September 26, Borges had gained 13 kg (29 lb) and said he was surprised by the reactions to his project. Two days later, Borges opened his room, which he considered a "work of art", for visitors.
Since the discovery of the contracts, there have been several accusations the case was a scheme to promote Borges's books. The Civil Police of Acre and the state's Public Security Advisory stated the disappearance was most likely a marketing scheme, which Borges and his mother denied. According to Borges, the main intention of his project was "to encourage people to acquire knowledge"[2] and the accusations were made by sensationalist media. Borges's friend sued Borges, accusing him of not handing over the books' proceeds as contracted.