Her friends are alarmed when high school student Bel is stricken with a strange illness after a wild night of forbidden dancing, drugs, and kissing.

As Bel worsens, her friends map everyone who kissed at the party. Chico and Alex pursue secret romances. Fran worries about her mother's health.

Fran languishes in the hospital while Alex and Chico try to solve the mystery of Manu's whereabouts – and the truth behind another rave in the forest.

The youth of Progresso become more rebellious. Alex and Chico try to save Fran by bringing her to the village. Alex uncovers a dark family secret.

A video of Chico spreads quickly, leading to a brutal attack. Alex exposes the source of the disease. Progresso parents unite to cure their teens.