Tanzania, Lion River Lodge: calm and luxury in the midst of one of the most beautiful wildlife reservations in Western Africa. Some billionaires have gathered for the annual convention of their international association for the protection of nature. Everything looks promising until the young and beautiful Sophie de Marçaignac is found brutally murdered. Who killed her? And why? Fanny Allema, field veterinarian, finds herself forced to lead the investigation. It's up to her to search, observe, and understand. Who is lying? Who is telling the truth? Accompany Fanny in the unexpected investigation she leads with diplomacy and humor, and discover the protected yet fragile nature of this region of Africa, its magnificent fauna, and the efforts of those trying to protect it. Fanny will learn- but who doesn't know it already? - that animals are not always the wildest ones, and humans not always the most civilized ones... So then, who is the lion, and who is the liar?