While the film opening uses some conventional elements of the mystery/thriller genre, such as including a cellar setting, it also challenges conventions in two key ways:
1) It reveals the crime (a girl's abduction) upfront rather than revealing it later, involving the audience earlier in trying to solve the crime.
2) It features an unconventional element of a man in a mask, whose identity is unknown, whereas audiences normally would know the identity of the criminal.
The film title "The Absence" and red font color are meant to provide clues about the genre and narrative while not fully giving away the plot, conforming somewhat to conventions while still creating intrigue for audiences.