Professor Eustacia Rose has been arrested for the possession of poisonous plants without holding the proper licence. Waiting in a grimy police cell, Eustacia's mind starts dredging up forgotten memories from childhood, when her father, a disgraced professor, was accused of murder. Linking all the memories is Marcus Smith, her father's unscrupulous assistant, a man she thought was long dead.

Marcus had ruined her father's career, stolen his research, and vanished after a heated confrontation. But the past never stays buried, as Eustacia knows all too well by now. With the help of DCI Roberts and determined allies, Eustacia races against time to expose Marcus's deception and unravel a fresh murder before it's too late.

This is her only chance to clear her father's name - and, at long last, be free of the burdens of her past.