Martin Harris returns home after spending three days in a coma to find that his wife doesn't recognize him and another man is living in his house under his name. The impostor shares all of Martin's memories, experiences and knowledge down to the last detail. Is it conspiracy? Amnesia? An elaborate hoax or his own paranoid delusion? Part moral fable, part thriller, Unknown isa fastpaced tale of one man's desperate attempt to reclaim his existence - even at the cost of his own life.