From 1968 to 1985, a serial killer terrorized Italy. Claiming 16 victims, the case of the true identity of the Monster of Florence, or Il Mostro (as he was nicknamed by the press), remains unsolved. Inspired by true events, this crime drama, created by Leonardo Fasoli (Gamorra, Zero Zero Zero) and Stefano Sollima (A.C.A.B., Romanzo Criminale), unravels one potential theory from the perspective of four unreliable narrators: the suspects themselves. The series stars Liliana Bottone (Parthenope), Marco Bullitta (The Mute Man of Sardinia), Francesca Olia (Timor), and Giacomo Fadda (To Rome with Love).