Set in the in the atmospheric & squalid streets of Paris Maigret sets out to prove the innocence of a man condemned to death for a brutal murder. In another one of Maigrets unconventional & audacious plans he arranges the escape of the condemned man in an attempt to prove his theory. The presumed murderer goes on the run across Paris & its suburbs dropping misleading clues along the way & leading Maigret into the labyrinthine twists of the mystery. Maigret is in for more than he bargained for as he encounters rich American expatriates dangerous foreigners & their hidden motives.