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Day Two

Laurie is determined that the abandoned baby and the body on the train tracks must be connected, as Gwyneth Hughes's gripping new five-part mystery continues. Her new boss, DI Mal Craig, however, remains cynical that there is any connection at all and enjoys telling Laurie she's wrong at every possible opportunity. But there's a growing respect – and possible attraction – between them both.

The police have little real evidence to go on until a young boy, who was messing around by the tracks at the time, hands over some mobile phone footage of the incident – suggesting there was a second person on the bridge. Maybe Laurie is right – was the suicide really a murder? She's even more surprised when she learns that the boy is Mal's son, Luke.

Across town, while at evening prayers, Nusrat is shocked to bump into a young man she knows. He is distressed and angrily refuses to talk to her before running off into the night. Who is he and what is he hiding?

Baby Michael, meanwhile, faces an uncertain future. With his real identity still a mystery, different parties vie to decide his fate.

Day Three

A week has now passed and Laurie, Mal and their team have had little success in finding out what happened, as the gripping new mystery continues.

They stage a reconstruction of the train incident in an attempt to find some new leads and Laurie's path crosses once more with some of the original passengers.

Danny and Nusrat try not to get too hung up on the idea of adopting baby Michael, but Nusrat has more pressing worries on her mind. It turns out that the young man she met at the prayer group is, in fact, her younger brother, Khalil, who has returned from a trip to Pakistan. Family tensions rise further still when her dad, Ibra, finds photographs on Khalil's laptop. What has he been doing and is he in trouble?

Mal, meanwhile, is horrified when he learns that his son has gone missing – especially since Luke has been staying with him whilst his ex-wife has been away on holiday. Back at the police station, Laurie is shocked to find train driver Pat waiting for her, with a confession related to the investigation. Later that night, when Laurie meets Mal in the pub, he makes a proposal she finds impossible to refuse…

Day Four

Two breakthroughs in the case begin to throw light on the identity of the body and baby Michael, in tonight's penultimate episode of the gripping new mystery. A girl has been arrested in Newcastle – and her prints match those found on Michael's buggy. She must be his mother.

Mal and Laurie's investigation, meanwhile, takes them to Scarborough to interview a man who claims to hold the key to unlocking the real identity of the body on the line.

Pat's involvement in the investigation deepens when it's revealed that he does know the mystery person who was on the bridge at the same time the incident occurred. But was it suicide or murder?

Elsewhere, Nusrat and Danny are worried about Khalil, who is suffering from depression. He suffers a panic attack at a Royal visit to the local hospital and is arrested by the police.

Mal and Laurie decide to stay on in Scarborough and nearly get a night away together. But their romance is thwarted when Mal's wife relents and agrees he can spend the weekend with Luke. They return to town but, as they get off the train, Laurie bumps into Sohel, the strange, edgy student she met on the train and at the reconstruction. He throws his rucksack at her and runs off suspiciously – followed, in hot pursuit, by Laurie and Mal.

Day Five

The time has come to decide on baby Michael's future parents, but someone else has a different idea of what's best for him and is prepared to risk all to get their way, as Gwyneth Hughes's gripping new mystery reaches its conclusion.

Nusrat and Danny are driven apart as they struggle to come to terms with recent events. And, as Laurie finally resolves the case, viewers discover what really happened on Day One.