This is a book I read at school in the 1970s. I recall it as a hardback. It may have been in the Heinemann's New Windmill Series (along with The Wheel on The School) - I have read through a partial list of New Windmills online but didn't recognise any of the titles. Unfortunately there doesn't seem to be a complete list of them with synopses. Probably published in 1960s or 70s; certainly before 1978.
This is the story: some children are staying in an old house in the twentieth century (when it was written - either in 60s/70s or it could have been that they were evacuated in 1940s?) and notice there is an extra window when viewed from the grounds, unaccounted for from inside the house. They spot a person moving about in this hidden room and make contact with him - he is a soldier from the English civil war, hiding from the other side. The children find a way into the hidden room and somehow travel through time whenever they interact with the fugitive. They help him by bringing him food and eventually enable him to escape.
This is the story: some children are staying in an old house in the twentieth century (when it was written - either in 60s/70s or it could have been that they were evacuated in 1940s?) and notice there is an extra window when viewed from the grounds, unaccounted for from inside the house. They spot a person moving about in this hidden room and make contact with him - he is a soldier from the English civil war, hiding from the other side. The children find a way into the hidden room and somehow travel through time whenever they interact with the fugitive. They help him by bringing him food and eventually enable him to escape.
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