Fernando's medical exam yields a stunning discovery, a logic puzzle stokes tension in the group, and Aline tries to find out what Ezequiel is hiding.

Trapped in the dorms without food and water, the candidates race to find a solution. A sudden change in the test brings out a new side of Marco.

Painful memories come flooding back to Ezequiel as Aline reveals she's learned and offers to keep it quiet - for a price.