Detective Sergeant Kate Miles is back from maternity leave and struggling on multiple fronts - the pressures of a second child, financial strain from her husband losing his job, and a corruption scandal that may involve her father. When an infant goes missing, Kate finds herself fronting a high-profile and emotionally fraught case. Was baby Sienna removed from her bassinet by an unknown abductor or is the answer much closer to home? Amidst a frenzied media demanding answers, and a station chief looking for any reason to remove her from the investigation, Kate is pushed to her limits, pulled between the competing demands of the family at the centre of the case and her own spiralling personal life.