It's 1921 Paris. The war is over. People are getting back to normal. Or as normal as one can get. Megan Rogers, Alya Cesaire and Marinette Dupain-Cheng own a Private Investigator business above their tea shop run by a family friend. During the day the trio's day job as PI's leads them to all sort of trouble. Not to mention their other day jobs when the PI work is slow. Alya uses her reporter column as a way to advertise the PI business and Marinette's fashion designs. The amount of business the gals get from the column is outrageous. Many people walk into their building with an article in hand. Several streets from their tea shop is a jazz club. That is owned by Megan and Lafayette D'Amour. It's the gal's favoured place to be at night. More than anywhere in Paris.