When what you saw was impossible, is honesty always the best option? When Esther Butler sees a man with a gun following a woman in the dark city streets, she doesn't hesitate to call the police. Minutes later in an empty building site, the man is dead. The police fired the shot. But when the smoke clears, there's no weapon to be found. Esther knows what she saw. Yet as her story begins to unravel, she's forced to question not just her memory, but her own safety. DC Josie Kaminski - assigned to the police team with the worst reputation in Leicester - is put on the case. But the deeper they dig, the more they find evidence linking Esther to the dead man and compelling reasons why she would want him dead. As truth and lies blur, the team must decide who to believe. And Esther stands to lose more than she ever bargained for. One shot. No gun. Everyone's hiding something.