On the day of her official retirement from the Force, DCI Monika Paniatowski looks at the two men and one woman who are no longer her team and thinks: Whatever the future holds, I will always be proud of you. She raises a toast. And just like that, her career as a homicide detective is over. Then, fifteen years later, Monika's former sergeant, Kate Meadows, makes a terrible mistake. Monika doesn't hesitate when Kate turns to her for help. She owes her, and she can hardly let her old friend go down for a crime she didn't commit. But as Monika gets deeper into the investigation, she's forced to ask herself the unthinkable: is Kate really innocent, or is she helping her old friend get away with murder?