Rose is a young and talented biologist. Her passion is insects and especially a firefly, from which she hopes to get a cure for cancer. Leo is also a biologist, working with her in Paris and New York. Everything seems to be going great, except that Rose fails to build a truly strong relationship with her colleague. She knows the sexual alchemy of the "bugs", but will it help her overcome her own problems?
The author skillfully delves into the consciousness and soul of her heroine, in the traumas of childhood, which left a deep imprint on her emotional world, in the clash with the powerful mother to reach the roots of her inability to live a full love life. Rose has a long way to go to realize that she longs for a "living" creature, not a fictional one.
In her original way, Katherine Pancol depicts the typical image of a modern young woman with a successful career, confident and strong in the profession, but confused and helpless in intimate relationships.