"Angi: Crimen y Mentira" investigates the murder of young Ana Páez, committed by María Ángeles Molina ("Angi") in 2008. This case was called "The Almost Perfect Crime" by the media and Angi is currently serving a sentence for it. Light is also shed on Angi's past, her marriage to Juan Antonio Álvarez Litben and the businessman's death in 1996.