The mysterious disappearance of the young engineer responsible for the machine which makes tunnels for underground railways turns into one of the most hair-raising cases in the career of private investigator Fermín Escartín. Escartín, ex-university lecturer turned detective, hasalready appeared in other novels of Fernando Lalana, but none of themas disturbing as The Tunnel - Driller, which combines irony, terror and mystery all the way through the book.