André Masson, an auctioneer at Scottie’s, receives a letter from a lawyer claiming that a common worker in the suburbs of Mulhouse owns a painting by Egon Schiele. André’s first reaction is to believe that it can only be a fake. He decides to make the trip to Mulhouse anyway and against all odds, the painting turns out to be a masterpiece gone missing in 1939. This could undoubtedly be the turning point of his career, but after a brief investigation, he realizes that he has in his hands a looted work of art.

Commissioner Maigret rushes to the Quai d’Orsay with Lieutenant Janvier. There, they find Mademoiselle Larrieu in a state of shock. That very morning, she discovered the bullet-riddled body of Mr. Berthier-Lagès, a renowned former ambassador whom she had served as a housekeeper for 46 years. While searching the victim's apartment, Maigret and Janvier uncover hundreds of letters. The diplomat had maintained a fifty-year-long love correspondence with a certain Princess of Vuynes, whose husband — by a strange coincidence — had died just a few days earlier. As he confronts the various members of the two families and the suspicious silence of Mademoiselle Larrieu, Maigret finds himself faced with surprise after surprise, watching his certainties crumble — until the solution to the mystery finally hits him in the face at the very last moment...

Nora is a bright young professional whose new job at a financial firm turns out to be a trial by fire when she learns that her bosses share a tumultuous history with her prickly mathematician father. Meanwhile, an interoffice romance with a competitive colleague leads to even more complications, leaving Nora to navigate a minefield of delicate relationships as she climbs the corporate ladder.