A police superintendent, after 25 years of a flawless professional career, is arrested by internal affairs for 4 days, before being indicted for criminal conspiracy, drug trafficking, theft and embezzlement by the magistrate in charge.
Police cadet Fred Leprince is found dead inside the police academy. His sister Émilie, also a cadet there, doesn't believe the suicide theory.
Captain Sara Bellaiche, from Toulouse Judiciary Police branch, is investigating a go-fast linked to the murder of two teenagers, an investigation led by Richard Cross, from the Paris Criminal Brigade. Forced to collaborate in order to find the murderer and stop the bloody go-fast, Sara and Richard are both thrown in a breathless race against the clock on the roads of Spain and France.
