Toño is the headmaster of a school in Gijón. After realizing that there are more bullying cases going on than he had thought, he decides to appoint someone as sentinel to be his eyes and ears among the students. He finds someone perfec...

Toño is the headmaster of a school in Gijón. After realizing that there are more bullying cases going on than he had thought, he decides to appoint someone as sentinel to be his eyes and ears among the students. He finds someone perfect for such a thing, but the boy refuses to be the headmaster’s snitch.

After understanding it is not what Toño wants from him, the boy starts being the sentinel, but he takes it too seriously.