Millie Olson would rather imagine life in the 19th century than face her 21st century life. She’s always been more academic than social and finding a diary written in 1865 by a young girl her age sets her history-loving heart on fire. But her grandmother’s insistence that she socialise reconnects her with high school quarterback Zach MacMillan. The last thing Millie expects is a friendship with Zach much less anything more, but as the sparks fly, she’s forced to confront her fears with a little help from 1865.