It's 11:45pm when a woman calls South Yorkshire Police to report her sister missing. Office worker Yasmin has failed to return home from work, which she finished over six hours ago. According to her family, this behaviour is extremely out of character for Yasmin, who normally rings immediately after work to let them know she's on her way home. Attempts to ring her have proved fruitless, and her phone now appears to be switched off. Sgt Becky Jones dispatches officers to find out more from Yasmin's family. But almost as soon as she starts looking into the case, Sgt Jones comes across some worrying information: Yasmin's ex-partner is currently on bail for stalking and harassing her.In Doncaster, a call comes in about another young woman who may be at risk. Amy has been staying with her mother since having a violent altercation with her ex-partner over a week ago. Today, she failed to pick her children up from school, and no-one has seen or heard from her since midday. It's now the evening, and with Amy still not answering her phone, her mum is becoming concerned for her welfare. PC Rob Hyatt from Doncaster Police Station starts investigating the case, and attention soon turns to Amy's ex-partner. Amy's social media status has suddenly been changed to ‘engaged' to her ex, but nobody knows whether Amy posted the update herself.(Some names have been changed to protect the identities of those featured.)