The Pathway to the Past

There's a lot of past, and there's getting to be more and more of it every minute. Richard and Cynthia Weatherspoon, aged ten and eight ("and three-quarters"), are living as (step)brother and sister in the midtwentieth century. But when they and their parents call on old Granny Ogden, the children discover that when they unlock Mrs. Ogden's back door, a path appears that simply isn't there to any...