Confession at the ending (SPOILERS)
The father of Margot finds out that Alex is wired and tells him that. Couldn't the police hear him say that?
Also he puts on the TV to make some noise. Is this the same noise when the police think they thought he found out that Alex was wired? But this was long after he began to talk.
So does Alex in the end knows the real story (Margot killing Philippe) ?