Whilst Nikki, Leo and Jack struggle to ascertain how Deanna was killed and ended up in the Thames, DI Gold focuses on two main suspects in John Briggs' inner circle. However, when Geraldine makes a sinister confession about why she gave her daughter up for adoption and disowned her wealthy family, it dramatically changes the course of the investigation. With the family's skeletons in the closet now exposed for all to see, the future of the ailing company hangs precariously in the balance. But when a third murder victim is found, it gives the team the forensic evidence to unravel the mysterious motives and smoke out the killer.