As in the The Ghosts, which formed the basis for the film, a mysterious Mr. Blunden arranges for a widow and her children to move to an old English house while the rightful heir to the house is tracked down. But in the film, young Lucy and Jamie are in 1918 rather than the 1960s, and the “ghost children” are from 1818 rather than the 1860s. Nevertheless, Lucy, Jamie, Sara, George, and Tom all have the same adventure in the past along with a cool Grandchild Paradox.