Book is in French Director of communications in a large pharmaceutical company, Maëlle Reed is invited to participate in an overseas medical conference. Before her departure, she promises to her sisters, Kaciane and Zara, to keep them informed throughout her trip. She also makes a second promise, to Simon, a charming investigator whom she enjoys provoking. However, none of these promises will be kept. Because, unbeknownst to her, Maëlle has a completely different agenda: suffering from heart problems, she is the ideal guinea pig to clandestinely test a drug that increases sexual desire in women... and drastically accelerates the heart rate! Faced with the dangerous relentlessness of the experimenters, while the sexual tension constantly increases, the fierce blonde will try by all means to extricate herself from her glass prison. Simon, discovering that she never left the country, will move heaven and earth to find her. Will Maëlle be able to see her sisters again? And the man she made a promise to?