Mary Gore was the daughter of James Gore and Freda Gore (née Wardlaw), sister of Isobel Gore, wife of Gordon Conall Lethbridge-Stewart, and mother of James and Alistair Gordon Lethbridge-Stewart.

She married Gordon in the early 1920s and moved to the Cornish village of Bledoe shortly after. They had two sons. The first, born in 1925, was named after her father, and the second, born in 1929, (PROSE: The Forgotten Son) or 1930. (PROSE: Blood Heat, No Future) was named after her husband's father. James died in 1938 (killed by the Great Intelligence), and his husband was recorded as Missing in Action in 1945. These two events were enough to convince her to leave Bledoe which she did, taking Alistair with her. Once they were some miles away the Great Intelligence ripped out all memory of James from their minds. For a short time, they stayed with Mary's sister, Isobel, and brother-in-law, Thomas (and their daughter, Lizzie), before eventually settling in Coleshill. After Alistair left home to at first, study, then later serve in the British Armed Forces, Mary resumed using her maiden name. (PROSE: The Forgotten Son)

According to one account, Alistair was an only child, and was raised in Simla, India, where his mother was from. She died soon after Alistair left for England. (PROSE: Island of Death)

On and off she was haunted by a boy, who would appear at the corner of her vision. He was there just before she left Bledoe and in March 1969, a man turned up at her door in Coleshill to take her to the boy. She was convinced the boy was a ghost of her husband, but when she finally reached Remmington Manor she discovered it was, in fact, a ghost of the son she couldn't even remember; Gordon James. In the event, it was really an avatar created by the Great Intelligence, which needed her to complete a link to strengthen it. Lethbridge-Stewart and George Vine arrived in time to defeat the Intelligence and save both Mary and Owain Vine. Mary didn't retain any memory of this, and woke up in her bed at Coleshill; still with no memory of James. She asked Lethbridge-Stewart permission to start courting Mr Cooper, and in return, he told her about Sally Wright, his fiancée. (PROSE: The Forgotten Son)

In December 1969, Mary met Sally, and she spent the Christmas period with Alistair and Sally in London. (PROSE: Home for Christmas)

Alistair spent some time visiting Mary in March 1970 and avoided telling her about his split from Sally. Mary could tell he was lying and badgered him with questions about what happened. Alistair's visit was cut short by a phone call from Harold Chorley. (PROSE: The Dreamer's Lament)

She was still courting Mr Cooper in August 1970 but faced a very unexpected dilemma when, after twenty-five years, her husband Gordon returned. (PROSE: The Man from Yesterday)

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