While attending an exhibition at the Crystal Palace, young cook Kat Holloway is approached by a woman in distress. Lady Covington is a wealthy widow convinced that her entire family is trying to kill her. Kat feels compelled to help. So, she escorts the lady home to discover whether she is delusional or in true danger. When it quickly becomes apparent that the threat is all too real, Kat promises aid but soon faces a serious threat when her involvement in plunges her into peril.