Karen Sharpe has been promoted to Detective Sergeant, but are the pressures of the job getting too much for her? When the battered body of a young girl is discovered, it kicks off an inquiry which pushes Karen and a trainee DC, Marcus Roth, too close for comfort, both on and off-duty. The investigation leads to a woman with a violent past - a woman with a six-year-old boy in her care... As the terrible truth emerges, the inquiry becomes a race against time before another child becomes a victim.