A better than average thriller, Neeson is ideal for the role.

Rating: Null/10 (22 July 2011)

While this is a totally different story, one has to be reminded of Neeson's role in "Taken" where he has to solve a mystery as difficult as this one.
Liam Neeson is Dr. Martin Harris traveling with his wife to Berlin to participate in a scientific conference. As they arrive it is cold and snowing at the Berlin airport and he rushes into the cab leaving the driver to load their luggage. We notice that the briefcase is left in the luggage carrier, and Martin only notices it when they get to the hotel.
So, knowing this is a movie of mystery and intrigue, it is natural to wonder, "Did the driver leave the briefcase behind for a reason?" Then, when Martin catches the first taxi back to locate his briefcase, and a traffic accident sends him into the river, we wonder, "Is that cab driver in on a plot against him?" And this goes on throughout the movie, trying to figure out what is going on. Because, when he finally gets back to the hotel 4 days later, no one knows him. His wife included, who is with a different Dr Harris. Neeson's character is now "Unknown."
This is a well-crafted movie and while it may have a few holes in the plot, overall is very entertaining. Diane Kruger is Gina, who happened to be driving the cab when it went into the river. She is a Bosnian refuge working extra jobs to save money to better her lot in life. January Jones is Martin's wife, Elizabeth Harris, who seems to not know her husband, while she claims that Aidan Quinn is the real Dr Harris. Other key roles are Bruno Ganz as investigator Ernst Jürgen and Frank Langella as the mysterious Rodney Cole.
(As a side comment, Neeson at almost 60 is 25 to 30 years older than Kruger and Jones, but that doesn't make much difference in the movies!)
SPOILER: When Martin wakes up in the hospital 4 days later, after a severe concussion and near death, he doesn't remember everything. This is key to the story because he really believes he is the scientist, Dr Harris. In fact he has no permanent identity, he is a professional assassin with multiple identities and multiple passports. Elizabeth is not his wife, they are part of a team to kill a scientist who has discovered a new corn hybrid that grows fast, is insect and drought resistant, and he plans to give this freely to the world, which will cut into certain company profits. When he goes missing the substitute "Martin" is pressed into service. In a complex series of happenings, everyone but Neeson's and Kruger's characters die, the scientist is spared, and the surviving couple get to go off together and start new lives.