Grace Marks was a poor, young Irish immigrant and domestic servant in Upper Canada and, along with a stable hand, was convicted of the brutal murders of their employer and his housekeeper in 1843. Grace was sentenced to life imprisonment, and became one of the most enigmatic and notorious women of 1840s Canada for her supposed role in the sensational double murder. Eventually exonerated after 30 years in jail, her conviction was controversial and sparked much debate about whether she was involved in the murder, or was merely an unwitting accessory.