The body of Charlotte Leigh is pulled from the Thames. After ruling out suicide, DS Brooks and DS Casey focus their enquiries on the victim's abusive ex-husband Richard with whom she was involved in a bitter custody battle over their teenage daughter, Holly. However, the investigation turns closer to home when it appears Holly was involved in a relationship with her mothers' new husband, Sean. Despite the evidence pointing to Holly, Crown Prosecutor Jake Thorne follows his gut and gambles on a hunch at the trial in a bid to draw out the real killer, and in turn uncovers the dark truth behind the façade of a seemingly perfect family.