Off-duty police officer Laurie Franklin finds herself caught up in a strange sequence of events after a person falls in front of her train.

A week on, the police carry out a reconstruction of events. Meanwhile, family tensions mount for Nusrat and Danny.

One day later the police are struggling to find out more about how the victim died, and the abandoned baby's identity is still a mystery.

A month has passed. A royal visit to the town turns nasty, and one character receives a visit from someone who seems to know more about what happened on the bridge.

A couple of months have passed. Will the police get to the bottom of what really happened on day one? And what does the future hold for baby Michael?