The Forgotten Door by Marjory Lack-Skidmore
https://www.alibris.com/search/book...KayNc4wd32PdnAB-bjhoCvpYQAvD_BwE&gclsrc=aw.ds
Or it may have been this one... not sure
https://www.abebooks.com/servlet/Bo...3Xzj6aGqh03bv9PIa053-qq3Ei7GaGuhoCd8gQAvD_BwE I read this when I was very young and have always had fond memories of it. I'm 63 years old and don't recall for sure which one I read (in the late 1960s)
https://www.alibris.com/search/book...KayNc4wd32PdnAB-bjhoCvpYQAvD_BwE&gclsrc=aw.ds
Or it may have been this one... not sure
https://www.abebooks.com/servlet/Bo...3Xzj6aGqh03bv9PIa053-qq3Ei7GaGuhoCd8gQAvD_BwE I read this when I was very young and have always had fond memories of it. I'm 63 years old and don't recall for sure which one I read (in the late 1960s)