It's 1944 and Flora Knox is enjoying a beautiful spring morning in the Swiss mountains, waiting on a railway station platform for a train. As Flora watches, a cattle train draws closer to the station, pulling a fleet of slatted trucks behind. But the trucks don't contain animals. From within come the sounds of humans, groaning, pleading, on a desperate journey across the Swiss countryside.

Horrified, Flora runs to the train as it slowly clatters through the station, and as she does so, a filthy bundle of rags is pushed out into her arms. Through the slats of the train, she hears a desperate plea: “Take him. His name is Simon.” As the train disappears, Flora is left holding a tiny baby boy.

Everything looks just the same as it did moments before - the sun, the sky, the station - but nothing will ever be the same again.