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.

Seventeen-year-old Dyna comes from a long line of risk-takers and is an avid thrill-seeker in her own right, until she takes a terrible fall and shatters her leg. Her life used to be about bike racing and rock climbing; now it's about staying home, except for attending physical and group therapy sessions at the bizarre alternative healing center her mom has chosen. Dyna's boyfriend saw her accident and supports her newfound desire for safety, but a young Iraq war veteran she meets at rehab challenges her to think about what she's really avoiding in her old life and to take chances again-even with her heart.