Planemo is a solitary wanderer, a sentinel of the galaxy. It is an orphaned world, a celestial body booted from its solar system by the chaos of planetary migration. In a society where everyone mindlessly orbits around their daily routines, what happens when a person gets ejected from the system? They might just find themselves rapidly pushed out of the habitable zone.

Summertime. The Mediterranean. Siesta. The father and son are asleep in the girls bedroom, while the dining room with sea view is bustling with life. The mother and two daughters are cleaning up after lunch. A tennis ball falls onto the balcony. The youngest daughter runs out. After talking to her boyfriend, she puts on tango music and the sisters start dancing. The mother sits down on the chair outside and looks out towards the sea. The father is awake. He looks in the direction of the sound and realizes things are about to change. Tango.

Summertime. The Mediterranean. Siesta. The father and son are asleep in the girls bedroom, while the dining room with sea view is bustling with life. The mother and two daughters are cleaning up after lunch. A tennis ball falls onto the balcony. The youngest daughter runs out. After talking to her boyfriend, she puts on tango music and the sisters start dancing. The mother sits down on the chair outside and looks out towards the sea. The father is awake. He looks in the direction of the sound and realizes things are about to change. Tango.

The Dark takes place over a period of 36 hours, on the first day of summer. Taxi driver Frane lives together with his sister and her husband in an unusual strange domestic arrangement. Frane learns that his sister is pregnant and he is not sure how he feels about the baby that she is expecting. After his night shift Frane kills a young unknown woman while he is having sex with her. He tries to cover up all traces of the crime, but in doing so he commits two further murders, one of which goes wrong. Throughout the film, the victims tell their stories at the places where the murders took place. On the morning of the summer solstice Frane thinks he has managed to get away with his crimes and he goes with his sister and her husband for a picnic in the forest by the river, not knowing what awaits him there.