A young gang member is found dead, and the Beck group's investigation indicates that a drug network is behind it. Klas Fredén has been monitoring the network for a long time, and the Beck group - led by Alex Beijer - is most graciously allowed to work with the murder investigation in parallel. She will soon end up on a collision course with Fredén. Thus, Martin Beck, who is now head of department, is also involved in the case.
Unfortunately the movie Beck 39 - Undercover is not yet available on HBO Max.
| Writing | Maj Sjöwall | Characters |
| Writing | Per Wahlöö | Characters |
| Art | Teresa Beale | Art Direction |
| Costume & Make-Up | Maria Felldin | Costume Design |
| Sound | Flemming Christensen | Sound Designer |
| Sound | Lasse Liljeholm | Sound |
| Sound | Stefan Ljungberg | Sound |
| Sound | Richard Löthner | Sound |
| Costume & Make-Up | Jessica Svensson | Makeup Artist |
| Costume & Make-Up | Emelie Wood Olsson | Makeup Artist |
| Production | Niva Westlin Dahl | Executive Producer |
| Production | Anders Landström | Executive Producer |
| Production | Calle Marthin | Executive Producer |
| Production | Tomas Michaelsson | Producer |
| Production | Anna Schmidt | Executive Producer |
| Production | Frank Seyberth | Executive Producer |
| Production | Josefine Tengblad | Executive Producer |
| Production | Bo Thörnwall | Executive Producer |
| Production | Kenneth Wiberg | Executive Producer |
| Production | Henrik Zein | Executive Producer |
| Directing | Pontus Klänge | Director |
| Writing | Johan Bogaeus | Writer |
| Sound | Adam Nordén | Music |
| Crew | Mats Axby | Cinematography |
| Editing | Håkan Wärn | Editor |
| Production | Tomas Michaelsson | Producer |
