1Descifrar el código del asesino (Parte 1)
Susan Gray, una descifradora de códigos, organiza un equipo para encontrar a un asesino tras descubrir un patrón en una serie de homicidios.
2Cracking a Killer's Code (2)
As Susan and the other Bletchley women close in on the murderer of the five girls, a shocking discovery calls their theories into question and forces them to set a dangerous trap - a trap that puts one of them in even greater danger.
3Cracking a Killer's Code (3)
Thrown into a chilling confrontation with the murderer they have so brilliantly tracked down, Susan and the other Bletchley women become locked into a ever more dangerous game of cat and mouse that leads to a seemingly inescapable conclusion.