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Hotel Manager Lukas Franke (Matthias Schweighöfer) finds himself a victim of a hacking attack, his online information altered to implicate him as having masterminded a cyber-attack on Berlin resulting in a city-wide blackout. Lukas goes to his estranged brother for assistance, who directs him to a local hacker, Dalton (Louis Hofmann).

Lukas continues to try to find out who is targeting him, while mounting evidence causes doubt in the mind of his wife. Directed by the hacker Kaufmann, Lukas travels to Frankfurt to deliver a package, where he meets Lena Arandt (Karoline Herfurth). Officers Jansen (Catrin Striebeck) and Siebert (Edin Hasanovic) begin their investigation of Lukas.

Lukas is questioned by the police, and learns that they believe he's planning further attacks, and is working with Lena. Hanna (Alexandra Maria Lara) is devastated following revelations leaked by the hacker. Jansen begins to suspect a leak within her department. Lukas finds Kaufmann, and demands answers.

Now suspected in the killing of Kaufmann, Lucas evades the police with Lena's help. Jansen suspects Siebert may be the leak. Hanna is questioned by the police, and is fearful for her safety, and that of their son Leon. Lukas establishes contact with Marc (Tom Beck), who demands that he locate a code that was sent by Case before his death.

Lena reveals her connection to Lukas, and opens up about her past. Lukas finds a clue from a previous meeting with Case, involving Leon. Arrested by the police, Lukas manages to send a warning to Hanna, alerting her that Leon is in danger. Lucas is taken from the police by the BND, the Federal police.

Jansen and Siebert begin to believe that Lucas is telling the truth, and widen their investigation. Marc frees Lukas so that he can continue his search for the code, and puts in motion a dangerous plan to buy more time and hide his tracks. Lukas races the clock to find answers and save his family.