A suicide on Platform 7 prompts a woman and a Transport Police officer to investigate the details surrounding her death.

Lisa and PC Akash continue to chase down clues about Lisa's death as Akash receives an unexpected lead and Lisa experiences a breakthrough.

A flashback to the beginning of Lisa and Matt's relationship gives vital clues to the state of her mental health, and how things eventually ended.

Akash races against time to gather evidence for Lisa's case as Lisa sets out to protect someone and to get justice.