In 1987, in Goiânia, two paper collectors find a radioactive capsule and sell it to the owner of a junkyard. Once the capsule is opened, more than 250 people end up contaminated by the substance called Cesium 137, being the biggest radiological accident in the history of Brazil.

Evandro Souza is an engineer and travels for the first time to the interior of the country, in the village of Barreira Pequé, on the banks of the Araguaia River. He begins to make friends with the natives of the region, like Marão, but what he did not expect was to be involved in a murder. Evandro was the only witness to the crime committed by Marão, however, when questioned, he does not know what to say. Until there is a meeting between Evandro, Marão and the local corporal.

Following the clues of a map, a boy and some adventurers go into the forest in search of treasure from the pioneers, and end up going back two centuries in time, in search of the legendary Minas dos Martírios.