Frank first met Claire Beauchamp when he came to consult her uncle, Quentin Beauchamp, about a point of French philosophy as it related to Egyptian religious practice. After a period of time, they were married, and spent a brief two-day honeymoon in the Scottish Highlands, followed by a year together before the outbreak of World War II.
Claire and Frank were separated for most of the war. Once the war was over, Claire and Frank reunited in 1945 (1946 in Cross Stitch) and decided to have a second honeymoon in the Scottish Highlands to reestablish their marriage. They stayed in a town called Inverness in the north of Scotland, which was situated near an ancient stone circle. Claire went missing at that stone circle.
They were reunited when she returned again in 1948. However, Claire had returned pregnant with another man's child and admitted to having married and fallen in love with her second husband. Frank said he did not believe Claire's story, choosing instead to believe that she was delusional and losing her grip on reality.
Feeling some sense of responsibility for the welfare of Claire and her child, Frank insisted on staying by Claire as her husband. He asked that while he lived, Claire would never tell Brianna the truth of her paternity. Their relationship over twenty years remained rocky, and Claire suspected that Frank maintained several mistresses throughout the marriage, though he was discreet. After an intense argument that started with Frank's announcement that he was leaving Claire and taking Brianna with him, Frank stormed out and drove away in the middle of the night. While Claire was at the hospital checking on a patient, she received word that Frank had been in a fatal car accident.
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