As her wedding approaches, Megan Pierce is troubled by a visitor from her past. Det. Mike Broome finds a new disappearance reminiscent of a cold case.

Megan enlists help from an old friend as she seeks out the truth about Stewart. Broome suspects a connection as more missing persons start piling up.

Dave's mother's claims of an unwanted visitor prove unsettling for Megan. Ray and Kayleigh both revisit the night Carlton - and others - went missing.

Harry brokers a meeting for Megan. Broome takes a leap in his personal life. Ray is questioned by the police as he tries to piece together his memories.

Megan's reunion with Ray is cut short. Broome and Erin investigate an anomaly in the pattern of disappearances, leading them to a complicated old case.

Dave's stag night turns testy thanks to an uninvited guest. Ken and Barbie turn their focus on Megan's family. Lorraine mourns the loss of a friend.

Broome and Erin try to deduce who the leak is on the force. Megan finally comes clean to Dave. Del Flynn realizes his hold on Ken and Barbie is tenuous.

In the wake of a shocking discovery, the case turns deeply personal for Broome. Megan and Ray finally unpack one fateful night from their past.