A Droga da Obediência (The Drug of Obedience) is the first book in a young adult fiction series by Brazilian writer Pedro Bandeira.
It features a group of teens who call themselves Os Karas (intentional misspelling of "Caras", that could be translated as "The Guys").
[2][3] Miguel is the leader of the Os Karas group of friends, who get together to investigate and resolve mysterious events.
The other members are Crânio, Magrí, Calu, and Chumbinho.
The group has a secret meeting place (under a trapdoor inside a closet of cleaning supplies) where they gather to talk about what could have caused twenty-seven students from several nearby schools to vanish.