1887, London: Percy Townsend doesn't want to be married and doesn't want to follow in his father's footsteps and take over as head of the family business. 2014, Denver: Callie Emerson just wants to make it through her senior year of high school alive. Neither of them are prepared for being introduced in the girl's restroom at the mall when Percy inexplicably finds himself in the twenty-first century, and Callie's not too eager to help him get back home.

Archer Morales's life is finally perfect. He's married to the girl of his dreams and finally has a job he enjoys. But when something completely unexpected happens, Archer discovers that his wife, Hadley, has been keeping secrets, and that his past isn't going to be staying in the past for much longer.

Hadley Jamison doesn't know what to think when she hears that her classmate, Archer Morales, committed suicide. She didn't exactly know him, but that doesn't stop her from feeling like there was something she could have done to help him. So to Hadley's surprise, on the very night of Archer's funeral, she has a run in with Death himself and is offered the chance to go back in time to stop Archer from ending his life. The catch? She only has twenty-seven days to do it. And if Hadley doesn't succeed? Well, she doesn't want to think about that.