In August 2018, Olivia Ronen, a young 28-year-old criminal lawyer, received the scanned version of a mysterious letter. The paper is signed with the name of the most monitored detainee in Europe at that time: Salah Abdeslam, the last member still alive of the commando of the attacks of November 13, 2015.
He wishes to meet her. How did he hear about her? Why did he choose her for his defense? To answer these questions, the lawyer decides to take the bus towards Fleury-Mérogis prison.