Suranne Jones and Lesley Sharp return in Scott & Bailey, the crime drama exploring the personal and professional lives of two female detectives. Season 4 sees both Rachel Bailey and Janet Scott in line for promotion but with only one sergeant's role up for grabs, they must compete against each other. Rachel's mum is back on the scene with a new boyfriend who Rachel discovers has a violent past. Janet has personal issues to deal with when her daughter decides to leave home. Rachel starts a new relationship, but because her lover is a senior police officer, she must keep it secret. And Janet unintentionally sparks trouble for boss Gill when she raises concerns about Gill's drinking. Will Gill make it through to retirement with her reputation intact?