Dorset, 1935. Stationmaster Ted has never cared much for romance. Occupied with ensuring England's most beautiful railway runs on time, love has always felt like a comparatively trivial matter. Yet when he meets Annie Galbraith on the 8.42 train to Lynford, he can't help but instantly fall for her. But when the railway is forced to close and a terrible accident occurs within the station grounds, Ted finds his job and any hope of a relationship with Annie hanging in the balance ... Present day. Recovering from heartbreak after a disastrous marriage, Tilly decides to escape from the bustling capital and move to Dorset to stay with her dad, Ken.

When Ken convinces Tilly to help with the restoration of the old railway, she discovers a diary hidden in the old ticket office. Tilly is soon swept up in Ted's story, and the fateful accident that changed his life forever. But an encounter with an enigmatic stranger takes Tilly by surprise, and she can't help but feel a connection with Ted's story in the past ...