Amusing but mediocre comedy dealing with a group of bungling detectives investigating adulteries and along the way carrying out diverting as well embarrassing cases . The IIS, International Investigation section, is an undercover detective agency expert on marriage infedility. Tony Leblanc is the boss and agency maker who uses modern,advanced and botcher techniques to get his purports. He is helped by Timoteo, Alfredo Landa, he is a fireman who in his free time uses to work at the agency, that's why he is regularly slept at the most unexpected places.Funny and fun Spanish comedy with a top-notch cast formed by the biggest hilarious actors from the sixties, Tony Leblanc, Lina Morgan, Alfredo Land and Manolo Gomez Bur. Dealing with silly incidents about unfaithful husbands, adultery, infedility, robbed photos and the peculiar means of investigation of this messy detective agency. Concerning their roguish and disconcerting adventures, as along the way they impersonate fake monks, swindlers, false gays, among others . It is a mediocre movie but it is makes it up for the great actors who play the sympathetic roles. This diverting comedy has its attractive moments here and there, being paced in ups and downs. There stands out a good support cast giving brief, but likeable acting, such as Laura Valenzuela, Maria Luisa San Jose, Ricardo Merino, Erasmo Pascual, Venancio Muro, Luchy Soto, Anibal Vela, Emilio Rodriguez, Javier Loyola, Fernando Sanchez Polack, and Maria Silva.Produced by prolific producer Jose Luis Dibildos from Agata films, he usually cast his wife Laura Valenzuela. Including agreeable score by habitual musician Anton Garcia Abril Abril and the atmospheric cinematography by Manuel Rojas. Graceful and laughing screenplay by the successful author Alfonso Paso and Jose Luis Dibildos himself. The motion picture was regularly directed by Fernando Merino and shot in fits and starts. Merino was a craftsman and professional director who achieved hits and flops. He is brother to also filmmaker Jose Luis Merino. And director assistant, as he assisted films as Tulipan negro, Fra Diavolo, Madame Sans Gene, Los tramposos, Armas para el Caribe, La venganza de Don Mendo. And directed a few films, ezpecially comedies, such as : El erotismo y la Informatica, La dinamita esta servida, Pisito de solteras, Los dias de Cabirio, Prestame 15 dias, Amor a la Española, Requiem para un empleado, though also made other genres as adventure : Dick Turpin, thriller : Comisario G en el caso del Cabaret and drama : Lola espejo oscuro. And Tv series as the known and popular Curro Jimenez .Rating 4/10 average. The film will appeal to Leblanc, Landa and Morgan fans .