Life seems to be back to normal for "newly twinned" sisters Miri and Molly until their magical house sends them on a new time-traveling adventure to the Civil War, where they must risk everything to save two unusual soldiers and come to terms with the emotional truth about Molly's past.
Eleven-year-old Miri Gill feels left out in her family, which has two sets of twins and her, until she travels back in time to 1935 and discovers Molly, her own lost twin, and brings her back to the present day.