Téa, Traquenard and Ténébreuse opened a vintage clothing store in Geronimo's garage, La Souris Vintage, which met with great success. Traquenard even unearthed a very valuable jacket, which belonged to the wife of the founder of Sourisia. The friends decide not to sell this historic piece, but Mya Non, niece of the insatiable Madame Non, the sworn enemy of Geronimo, tries to steal it from them ... will she be unmasked?