40 million people in Germany use the Internet. Anonymity is their cloak - and their security. But what if one day this cloak turns out to be an illusion? What if you are suddenly exposed in the online world? What if there is suddenly someone who knows exactly who you are...? And wants to kill you! Hannah and Nadine thought they were safe in the worlds of the Internet. Until they meet a mysterious stranger - who threatens to kill them in 40 minutes. What sounds like a tasteless joke is cruelly serious! For Hannah and Nadine an unprecedented terror begins, because the unknown is closer to them than they think...