[4] As of 2016, his books have sold over a million copies,[5] and in 2018 he was named, alongside Max Mallmann, Raphael Draccon and Eduardo Spohr, one of the leading Brazilian fantasy writers of the 21st century.

[2] Vianco was always into horror films and literature, and cites Stephen King (to whom he is frequently compared), Eiji Yoshikawa's Musashi, Edgar Allan Poe, Anne Rice's The Vampire Chronicles, Henry James, Victor Hugo and old Tales from the Crypt comics as some of his favorite readings and major influences.

Set for the most part in the fictional coastal town of Amarração, Rio Grande do Sul, the book tells the story of a group of seven vampires from 16th-century Portugal, awakened from their deep slumber in late 20th-century Brazil after their bodies are found by two divers in a sunken carrack.

Os Sete has also spawned the sequels Sétimo and the trilogy O Turno da Noite, and the prequel Vampiros do Rio Douro, a graphic novel in two volumes illustrated by Rodrigo Santana.

In 2009, to celebrate the 10th anniversary of Os Sete, Vianco himself wrote and directed a 3-part TV pilot based on the O Turno da Noite trilogy, but it was never picked up for a full series.

[11][12] In 2012 he teamed up with Davi "Deivs" Mello and illustrator Denilson Santtos to write Escuridão Eterna, a graphic novel spin-off of O Turno da Noite; it came out amid mixed reviews.