His older brother, a famous traveler, comes to visit Georgy Rodin, a practicing doctor in the provincial town of Starokuznetsk. Among other expensive gifts, he brought a golden amulet in the shape of a heart, which, as legend says, belongs to the mythical Indian tribe of love. But with the appearance of this little thing, strange events begin to occur in the town... Being a realist, Georgy does not believe in the magical effect of the amulet and, trying to find a rational explanation for everything that is happening, equips an expedition into the Amazon jungle. However, literally from the first steps, the expedition members begin to be pursued by an unknown attacker...< /p>