Entertaining and suspenseful, is there really a hijacker on the flight to London?

Rating: Null/10 (18 August 2014)

This movie of course manipulates the audience, it has to last almost 2 hours so they created ways to lead us towards one direction, then another. I admit, it had me guessing and in the end all my guesses were wrong.
Ever since he was so successful in "Taken" as the special ops guy who can defeat almost anyone in almost any situation, Liam Neeson has had serial success in similar roles. And for good reason, he is big, menacing, and good in those roles.
Here he is Bill Marks, an air Marshall, being assigned to a non-stop overnight flight from New York to London. It is about a 6 to 6 1/2 hour flight. Things seem to be going smoothly, he meets a seemingly nice lady sitting next to him, Julianne Moore as Jen Summers.
When everything is quiet, with the plane at cruising altitude over the Atlantic, things begin to get strange. Bill gets a text message on his secure phone. As more and more messages come through it is clear that someone, most likely on the airplane, wants $150 Million to be transferred to an account otherwise a person will be killed every 20 minutes.
On the surface that would seem easy to sniff out and prevent but it gets very complicated. So almost all of the movie involves Bill's efforts to safe the passengers and save the plane, once he suspects there might also be a bomb onboard.
(As a side note, it was nice seeing Michelle Dockery as one of the flight attendants, Nancy. She is so cute I could watch her in anything.)
SPOILERS: The first person to die, quite mysteriously, was the pilot. Later Bill discovered a hole from the toilet wall to the cockpit and remnants of a blowpipe, he had been shot with a poisonous dart. After he had to fight and kill the other air Marshall he discovered cocaine in that man's briefcase, but hidden inside was also a bomb. The account for the money was actually Bill's account, so he was suspected of being a terrorist, but that was a ruse by the two guilty men, who had a plan to parachute to safety once the plane was brought down to 8000 feet, then the rest would die in the blast and plane crash, allowing them to capture Bill's money that would have been transferred to any number of trusts around the world. But Bill sniffs them out, they are killed, the bomb explodes but having put it near an exit door with all the luggage stacked against it, the copilot was able to crash-land the plane and all survived. Bill and Jen made a date.