Nightmare Hunters. Book 1. Dossier 1: Sarah; Dossier 2: Nicolas

Tristan and Esteban are ordinary schoolboys, but in their free time they engage in quite an unusual activity – under the guidance of Professor Angus at the sleep clinic, the friends travel through dreams, freeing desperate people from terrible night terrors. It so happens that only teenagers can sneak into someone else's subconscious and find the source of bad dreams. The boys' usual lives are disrupted when Sarah arrives at the clinic. The longer Esteban stays in the girl's nightmare, the more convinced he becomes that the professor is hiding something from him...
This story begins as an exciting suspense filled with unexpected plot twists and nightly fears, but quickly presents the characters with an important question: is it right for a person to invade someone else's subconscious even with good intentions?