A programmer is invited by his reclusive boss to spend one week at his private estate. There he is given the task to test his creation, a female robot to see if it passes the "Turing Test". Of course its not too long before we ask who is testing whom, and that includes the viewer.
Here is a movie where I do not want to give too many spoilers. The full enjoyment of the movie comes from not knowing what is going on until the very end