Eleven-year-old Miri Gill knows exactly what it feels like to be the odd one out. Stuck directly between two sets of twins, she is the only child in her family without a built-in best friend. To make matters worse, her family has just moved into a creepy, drafty old farmhouse in a brand-new town. The only interesting thing about the new house is Miri's strange, ten-sided attic bedroom. After a frustrating argument sends her to her room, Miri discovers something impossible. By stepping through a specific spot on the floor, she is transported straight back in time to the year 1935. There, she meets Molly, a girl exactly her age who is trapped in a miserable situation and desperately needs a loving family. Suddenly, Miri has the chance to do something extraordinary. She must figure out how the time-travel magic works, outsmart the cruel people keeping Molly captive, and find a way to bring her new friend safely into the present day. This heartwarming and suspenseful adventure is a brilliant tale of sisterhood, bravery, and finding where you truly belong.