A Wrinkle in Time by Madeleine L'Engle is a science fiction/fantasy novel for young adults originally published in 1963. The story moves across time and place, with a version of time travel being essential to the plot.
The initial setting is a contemporary (i.e. early 1960s) town in the United States where the protagonist Margaret “Meg” Murry and her brother Charles Wallace Murry live and attend school. Meg and her brother have difficulties at school. This school setting establishes first, a bond of sympathy between the readers and the children, and also emphasizes the closeness and love between Meg and her brother.
The other worlds to which the children travel by means of the tesseract are emblems of the spiritual world, where the fight between good and evil is more immediately obvious than on our world. As the children move from the ordinary earth, through the haunted house, to the alternative worlds, what they reveal are the true nature's of their souls behind their everyday selves, slowly becoming their essential natures.