Immediately after Susana's accidental death, the group makes a pact to keep their involvement a secret and never speak of it again. 15 months later, the group is about to graduate and achieve their dreams. Everything is looking good for them until @todostussecretos reactivates and threatens to take away what they love most: their bright and shiny future. Once again, it's up to Sofía to find out who's behind this new threat before it's too late.

Someone intent on seeking vengeance for Luis starts targeting students and teachers at the high school as Sofía rushes to solve the latest mystery. This school year, secrets aren't the only thing at stake. Someone will make them pay for all the trouble they've caused.

When a hacker begins releasing students' secrets to the entire high school, the socially isolated but observant Sofía works to uncover his/her identity.