For 11-year-old Lukas, an incredible adventure begins the moment he and his mom set off on a long awaited summer holiday trip. The joyful travel is suddenly interrupted by a car accident that results in the boys and his mom hospitalization. When it turns out Lukas’ mom is in a coma, the boy must be taken care of by his only relative – aunt Agatha, whom he gets to meet for the first time in his life. Agatha brings the boy to her own guesthouse by the seaside, and places him in a room his mom used to live in. It’s the room where Lukas accidently discovers a secret passage to a different dimension and soon learns what amazing and yet frightening mysteries the newly disclosed world hides.
The blue door in his room is a gate to different reality. There he meets a dangerous creature, which he will have to face.
This experience will challenge the boy confronting him with the difficulties of his situation; his fears, loneliness, helplessness and longings.