Biochemist Martin Harris (Neeson) wakes up from a car accident to discover that his wife doesn't know who he is and several people want him dead. Luckily Bosnian cabbie Gina (Kruger) is on hand as he frantically tries to piece things together.
Arriving in Berlin, Biochemist Martin Harris (Liam Neeson) is in a cab accident. When he emerges from a coma, his wife (January Jones) claims another man (Aidan Quinn) is him. Aided by a Bosnian cabbie (Diane Kruger) and an ex-Stasi private eye (Bruno Ganz) and pursued by killers, Martin tries to understand. Unknown pulls a revelation every half-hour which throws all you thought you knew up in the air — things that seem plot-holes make sense later, but things which seem straightforward become demented contrivances. Neeson see-saws between Harrison Ford in Frantic and himself in Taken as unlikely premise king Jaume Collet-Serra (Orphan) stages good action sequences.
The plot twists are occasionally loopy but Neeson is on safe turf here and director Collet-Serra shows a deft eye for an action sequence.