Lara Finch lives a lie. Everyone thinks she is happily married to the faithful Sam. She is actually super bored and misses working. Behind Sam's back, she takes a job in London. Twice a week she takes the sleeper train, where she meets Ellen and Guy. One Friday, Lara disappears from the train without a trace. Her friend Iris does not believe the official story she is told about the disappearance and decides to start her own investigation. Iris cannot believe what she finds out.