"Fille Fiable just makes people people trust you. If you give them a nose full, they're more willing to tell you their secrets - or believe whatever you tell them"
-Iris explains Fille Fiable
Fille Fiable is used to make it's user seem more trustworthy and reliable.
"Iris opened a cabinet and retrieved a silver serving tray. On top of it sat two crystal bottles filled with amber liquid"
- Ananka describes Fille Fiable and Eau Irresistible.
Fille Fiable was kept in a crystal bottle and was described as amber colored. It also smelled really badly, which made Oona say it should be called "Eau de BO".
"Then I read in the newspaper about these scientists in Switzerland who had come up with a spray that makes people seem trustworthy. When I told DeeDee about it, she offered to help me improve their formula."
- Iris explains her idea behind Fille Fiable
Fille Fiable contains a chemical called oxytocin, responsible for bonding between people. Fille Fiable was created after Iris read about a Swiss formula that used oxytocin by making it more powerful.