Irish Police Detective

10am: A mother rushes for a train after dropping her daughter at school but is reported missing when she doesn't return to pick her up. 2.47pm: The same train causes the death of a young woman; her body bound and placed on the tracks. When Detective Alana Mack discovers the missing mother has vanished from the same train that claimed the life of the young woman, she fears the worst. A killer is on the loose, targeting women and leaving their broken bodies scattered across Dublin's Dart train line.

Eddie Sutherland is dead. Normally, Detective Wes O'Brien wouldn't care about another dead drug dealer, but he may just be the man who killed him. Thrown off the force and under investigation, Wes is called upon privately to look into a cheating spouse case.

When an elderly resident of a care home passes away during the night, little is thought of it. But when a routine investigation turns up an anomaly, suspicions are raised. DS Fiona Moore follows her instincts that it is death by foul play and launches a murder inquiry. It is not long before there is a similar death. Concerned that they have a serial killer on their hands, DS Moore is nudged off her central role by her boss.