Colette Valier wears her sixty years with petulance. She wants to help her grandson financially, who is setting up a modest business and intends to take advantage of her deceased husband's stock portfolio to recover funds. To her great surprise, she discovers that the investments made at the time are now worthless. Determined to assert her rights, she goes to Paris and asks for help from an old friend, Charles. Living with her daughter Véronique, who is overexcited by Parisian life, Colette discovers a turbulent family, a careerist and absent husband, agitated children and a depressive permanent guest, Arnaud. In this electric atmosphere, Colette begins her investigation.