On a searing summer's day paramedic Holly Garland rushes to an emergency to find a man collapsed with a bullet wound in the back of his head, CPR being performed by two bystanders, and her long - estranged brother Seth watching it all unfold.<br/>Seth claims to be the dying man's best friend, but Holly knows better than to believe anything he says and fears that his re - appearance will reveal the bleak secrets of her past - secrets which both her fiance Norris and her colleagues have no idea exist, and which if exposed could cause her to lose everything.<br/>Detective Ella Marconi suspects Seth too, but she's also sure the dead man's wife is lying, and the deceased's boss seems just too helpful. But then a shocking double homicide related to the case makes Ella realise that her investigations are getting closer to the killer, but also increasing the risk of an even higher body count.<br/>