A mute man with a violent past is forced to take on the teeming underworld of a near-future Berlin as he searches for his missing girlfriend.

Doctor Nina falls in love with the charismatic architect Mark, who was imprisoned for manslaughter. Her neighbor Melanie, unlike her husband, is thrilled with Mark. But one day Melanie disappeared without a trace.

The future is here: via so-called ports—USB-like connections on the head—human brains can be directly connected to computers. This enables things like upgrades (foreign languages! expert knowledge!), virtual buzz experiences, and even the networking of multiple brains. A group of neurohackers tries out everything and even develops their own apps. Only Mona is decidedly against this technology; the danger of external control just seems too great.