Codename: Thanatos (part 2) - Hallgrim and team work to discover the identity of "Groom" who is the main suspect of the child's murder. When it is discovered that his wife is attached to a child rescue program more questions arise about the child pornography ring.
Codename Minos (part 2) - while the team deals with their loss, the pursuit of Bosch continues. Hallgrim learns of new jamming technology which could have devastating impacts. Thea and the Serbian Interior Minister are abducted.
Codename: Ithaca - Hallgrim receives a message from beyond. Before leaving for Iceland, Hallgrim finds that Bosco has escaped. Michael is charged with homicide and must leave the team. Frida gives birth and Hallgrim goes to Stockholm to be with her and his daughter. He finally makes it to Iceland where he runs into members of the Russian mafia and Colombians. Michael shares his theory of organ theft with Frandson which relates to Bosco and his sick daughter - a child's heart for the jamming technology.