Going back to looking at old favourite kids' books. #childrensbooks

Here's one that's really old.
Margot Pardoe was a children's author. Her Argle books feature the MacAlister children and their tutor in three time slip adventures. In Argle's Mist they travel through time to Celtic Britain, in Argle's Causeway to Norman England, and in Argle's Oracle to classical Greece. All three were published in the 1950s.