A struggling writer, Evelyn Carter, stumbles upon an old locket in her grandmother’s attic. When she opens it, she’s suddenly transported back in time to 1915, where she meets Theodore "Theo" Whitmore, a wealthy but kind-hearted businessman trapped in an unwanted engagement. As Evelyn tries to find a way back to her time, she and Theo fall deeply in love. But with history pulling them apart, will their love survive across time?