Ms. X, famous investigator, is at her lowest ebb. Ever since she was bitten by the duermevela mosquito, she can't solve a mystery without falling asleep in the middle of the crime scene. Everything gets complicated when a misunderstanding leads her to teach at a school. Her students Lena, Alex, Bruna and Henry decide to turn the extracurricular activities into a detective agency and help Ms. X to recover her prestige.