Carmen Mola is a collective pseudonym of three Spanish writers of crime thrillers. The real authors are Jorge Díaz, Agustín Martínez and Antonio Mercero, best known as television scriptwriters. From Wikipedia
Official tallies show Top 10 placement in 80 countries—number one across major markets including Spain, France, Mexico, Argentina, Brazil, Colombia, Italy and Turkey, with a top‑four rank in the U.S.