It is Charlotte's first night at boarding school, and as she's settling down to sleep, she sees the corner of the new building from her window. But when she wakes up, instead of the building there is a huge, dark cedar tree, and the girl in the next bed is not the girl who slept there last night. Somehow, Charlotte has slipped back forty years to 1918 and has swapped places with a girl called Clare. Charlotte and Clare swap places ever night until one day Charlotte becomes trapped in 1918 and must find a way to return to her own time before the end of term.

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Penelope Farmer was born in Kent, in 1939, the younger of twin girls. After boarding school and Oxford University she did a variety of jobs, from teaching to working as a filing clerk, followed by a year of social studies at London University. Then she settled down to raise a family and write full time. Over the course of her long career as a writer, she published many novels and short stories for adults and children.