It's rural England, just after the turn of the last century. Charlotte married Edward Shift after the sudden death of her first husband, Horace Torrington. They live at Sterne, the home they are in danger of losing due to a financial crisis, with Charlotte's three children: Emerald, Clovis and Smudge. On the day of Emerald's birthday party, a terrible train wreck occurs on a branch line and the stranded passengers seek refuge at Sterne. Among these passengers is Charlie Traversham-Beechers, a sketchy figure from Charlotte's past. This unusual guest list makes for an unforgettable birthday celebration for Emerald and an evening of the past literally coming back to haunt Charlotte.