The investigation is halted; David confronts Gardaí's top officials to expose Gill and Gough, but he finds no support; Lisa and Brennan follow a lead on the killer, investigating an abandoned ...

Documentary examining a number of high-profile disappearances and murders of women in the 1990s in an area taking in Dundalk, Wexford and Tullamore, which became known as the Vanishing Triangle.

Lisa's article criticising the Gardaí for not acting on Amy's disappearance is leaked; David and Detective Brennan chase a lead in Castlemoy; impatient with the police's pace, Lisa risks her life ...