Pepe le Moko, Charles Boyer is a notorious jewel thief who has escaped from France and made the Casbah, or "native quarter," of Algeria, his home for two tense years. The Casbah buzzes with life—narrow lanes, open-air markets, and a wary truce between locals and outsiders—yet Pepe moves through it with a suave confidence that makes him both admired and feared. His reputation lends him protection, but it also makes him a target for those who want to claim Pepe as their prize or bring him to justice.
Commissioner Janvier, Paul Harvey, a dogged French detective, is determined to put an end to Pepe’s elusiveness once and for all. He enlists Regis, Gene Lockhart a wary thief who resents Pepe’s untouchable status, to guide a calculated raid. Regis leads the investigators to Grandpere, Alan Hale a veteran confidant whose knowledge of the Casbah’s currents could crack Pepe’s carefully guarded world. The plan hinges on timing and nerves, and the tension in the Casbah thickens as the raid closes in.
Regis corners Ines, Sigrid Gurie Pepe’s alluring mistress, with the unsettling news that the police are closing in. Ines races to Grandpere’s house to warn Pepe, a move that puts Pepe on edge and makes him wonder whether Regis has betrayed him. When the raid erupts, Pepe ducks into a basement hideout, the air filled with gunpowder and fear. The shooting rages above him, chaos tearing through the Casbah, and Pepe manages to slip away, though not unscathed.
In the midst of the upheaval, Inspector Slimane, Joseph Calleia, an Algerian detective with a wary respect for Pepe, brings Gaby, Hedy Lamarr, a French tourist, to his residence. Slimane is both captivated by Pepe’s audacity and obsessed with documenting the chase, even writing the date of Pepe’s arrest on his wall as if to pin a trophy to the room. Gaby, meanwhile, is drawn into a different current of emotion—she is engaged to Giraux but finds her thoughts returning again and again to Pepe and the spark they shared.
The next day Regis meets with Chief Inspector Louvain, Walter Kingsford, and the pair scheme to reel Pepe in by targeting one of Pepe’s friends, Pierrot. Regis delivers a note to Pierrot, disguised as a message from his ailing mother, intended to pull him back into a trap. At the same time, Gaby contemplates her future with Giraux, even as Slimane quietly tests her resolve by sharing tales of Pepe’s fixation on glittering jewelry and the life he could have if he walked away from the Casbah.
That night Pepe learns that Pierrot has apparently left Algiers. He heads back to the Casbah, pressing Regis for answers about Pierrot’s sudden disappearance. The reunion with Gaby at the Casbah rekindles memories of their time in France, and they conceive a plan to see each other again the following day, even as Gaby’s engagement looms over their clandestine meetings.
A funeral watches Pierrot’s coffin in the Casbah’s public square, a moment that saturates Pepe with grief and anger. Ines steps in again, lying that Gaby is waiting at Pepe’s home, hoping to derail him from the path that leads toward danger. Pepe, moved by the deception yet grateful for Ines’s protection, continues to navigate the delicate balance between loyalty and desire. Gaby eventually arrives, and the two lovers acknowledge the impossibility of Pepe’s longing to escape the Casbah’s pull. They vow to meet again, tomorrow, at her hotel.
Slimane amplifies the pressure by instructing Giraux to keep Gaby away from Pepe, but when that ruse fails, he fabricates a worse lie: Pepe has been killed. The deception deepens the trap that Pepe barely dodges, heightening the sense that Pepe’s fate is sealed to the Casbah’s rhythm.
Pepe learns that Gaby and Giraux are preparing to depart Algeria on a steamship that afternoon. L'Arbi, Leonid Kinskey a wary observer with his own agenda, warns Pepe, but the news does not deter him. He buys a steamship ticket, determined to reach Gaby one last time, even as Slimane’s men close in.
On the docks, Pepe spots Gaby as he tries to reach her aboard the ship. The plan collapses under the weight of surveillance and pursuit. One of Slimane's men shoots Pepe, and Slimane cradles the wounded man, offering a hurried apology as the crowd—unaware or resigned—looks on. In his final, defiant moment, Pepe lifts his gaze toward Gaby and whispers with stubborn resolve, “And so I have, my friend.”
