It goes without saying that Jodie Foster was great in this movie. She's great in any movie. Her strong performance actually created many of the red herrings thrown to undermine an otherwise predictable script.
Jodie Foster stars as Kyle Pratt, a propulsion engineer whose husband recently fell from a tall building and was killed. She's uprooted her six-year-old daughter from their home in Berlin, in order to return to Kyle's hometown in the USA.
So far, so tragic, but things take a turn into strangeness, when little Julia Pratt disappears. As one person tells Kyle, the airplane is fundamentally a large tube. How far could a young girl wander?
But there's a bigger question here. Kyle's husband committed suicide. His coffin is in the hold. Kyle is on medication and she admits to having taken a walk around Berlin with her husband's ghost. She's paranoid and dazed. Was her daughter ever even there? According to ground control, Julia was in her father's arms when he jumped.
This could either be a movie about a woman slowly going insane in a public, confined space. Or it could be about an unlikely abduction. Jodie Foster's strong performance makes both interpretations seem feasible. The crew, other passengers and viewers are kept guessing until the climactic ending.