A ruthless need / Catherine Cookson.

Even in the heat of battle, Geoff Fulton would always carry with him the memory of the night he was on leave, when his timely intervention rescued fourteen year-old Lizzie Gillespie from the oldest of perils for a young girl. The year was 1937 and the place a rural enclave of County Durham. Seeing in Lizzie a girl of spirit, Geoff concluded that she might, with care and training, solve his problem and benefit herself. So, despite a token resistance from Lizzie's slatternly stepmother, it was agreed that the girl should become a companion/helper to his increasingly handicapped mother. But, in 1943, when Geoff returned wounded from the desert war, it was to find a Lizzie he hardly recognised--mature and highly attractive. For her part, she could see that he was embittered by his experiences at war, for he now displayed a ruthless streak far removed from the caring person she had previously known.