The movie stars Jodie Foster in a story that bears similarities to her "Panic Room" (2002). In both films, a woman uses courage and intelligence to defend her child against enemies who hold all the cards. The problem she faces in "Flightplan" is more baffling: Who are her enemies? Why would they kidnap her daughter? How is it possible on an airplane?

For that matter, has it really happened? Foster plays Kyle Pratt, a jet propulsion engineer who has been employed in Germany on the design of the very airplane she is now using to cross the Atlantic. She is on a sad mission. Her husband, David, has died after falling -- she insists he fell and did not jump -- from a rooftop. The coffin is in the hold, and she is traveling with Julia (Marlene Lawston). She falls asleep, she wakes up, and Julia is gone.

Kyle methodically looks around the airplane, calm at first, then on the edge of panic. She tries to seem more rational than she feels, so the crew won't dismiss her as a madwoman. Certainly they're tempted, because the passenger list lacks Julia's name, the departure gate at Munich says she did not get on the plane, and her boarding pass and backpack are nowhere to be found. The captain is Sean Bean, very effective as a man who knows what his job is and how to do it. Peter Sarsgaard plays the in-flight air marshal, under the captain's orders. They receive a message from Munich informing them that Julia was killed along with her father. Obviously, the traumatized mother is fantasizing

And that's all you'll find out from me. There is no one else I want to mention, no other developments I want to discuss, no other questions I want to raise. If someone tries to tell you anything else about "Flightplan," walk away.

The movie's excellence comes from Foster's performance as a resourceful and brave woman; from Bean, Sarsgaard and the members of the cabin crew, all with varying degrees of doubt; from the screenplay by Peter A. Dowling and Billy Ray; and from the direction by Robert Schwentke, a German whose first two films were not much seen in North America. This one will be.