Codename: Scylla

S1, E3: Codename Scylla - when a financial leader, Sigurd, is found dead outside Hallgrim's hotel the team investigates, which reveals that the suspected murderer is the father of her son. The investigation also finds that financial fraud was being committed by Sigrid's company. Thea wants Hallgrim to see a therapist. Hallgrim receives a call from Sergei.