Magda, die lang geleden haar carrière heeft opgegeven omwille van haar gezin, woont in Podkowa Leśna, in de buurt van Warschau. Op een avond ontdekt ze bij toeval het lichaam van een vermoorde vrouw in het park. Ze heeft een W-vormige ketting om haar nek, identiek aan die van haar lang verloren gewaande vriendin, Weronika. Hoewel het officiële onderzoek geleid wordt door commissaris Jacek Sikora, een voormalige vriend van Magda die verliefd op haar was, besluit Magda als dwangmatige lezer van misdaadfictie zelf op onderzoek uit te gaan.
Ja! de film W jak morderstwo is nu beschikbaar om te kijken op Netflix in Nederland.
| Directing | Piotr Mularuk | Director |
| Directing | Barbara Burska | Assistant Director |
| Editing | Agnieszka Glińska | Editor |
| Sound | Paweł Lucewicz | Original Music Composer |
| Production | Nadia Lebik | Casting |
| Production | Kacper Habisiak | Co-Producer |
| Production | Piotr Mularuk | Producer |
| Camera | Łukasz Zygmunt | Grip |
| Writing | Piotr Mularuk | Writer |
| Editing | Michał Krajewski | Digital Intermediate |
| Camera | Marcin Brzezek | Grip |
| Writing | Katarzyna Gacek | Writer |
| Camera | Adam Bajerski | Director of Photography |
| Camera | Romuald Lewandowski | Camera Operator |
| Camera | Krzysztof Szulim | Grip |
| Camera | Adam Bajerski | Camera Operator |
| Writing | Katarzyna Gacek | Novel |
| Directing | Konrad Bajno | Assistant Director |
| Camera | David Bajerski | Camera Operator |
| Lighting | Maciej Chmielewski | Master Lighting Artist |
| Art | Daniel Feliński | Assistant Property Master |
| Art | Sebastian Glinicki | Assistant Property Master |
| Sound | Kacper Habisiak | Sound |
| Crew | Mirosław Pisarek | Stunts |
| Art | Marcin Łakomy | Props |
| Art | Magdalena Dymińska | Assistant Property Master |
| Sound | Ewa Wrzesińska | Dialogue Editor |
| Costume & Make-Up | Ewelina Krzywda | Hairdresser |
| Costume & Make-Up | Julia Ślusarczyk | Costume Assistant |
| Art | Jakub Kaleta | Assistant Production Design |
| Art | Marcin Gloeh | Assistant Property Master |
| Crew | Agnieszka Pawłowska | Stunts |
| Crew | Aneta Kielak | Catering |
| Crew | Joanna Jakubik | Public Relations |
| Art | Natalia Giza | Production Design |
| Art | Mikołaj Makulski | Assistant Property Master |
| Costume & Make-Up | Dorota Roqueplo | Costume Design |
| Costume & Make-Up | Weronika Pietrzak | Costume Assistant |
| Sound | Kacper Habisiak | Sound Director |
| Costume & Make-Up | Marta Tesche-Klimek | Makeup Department Head |
| Camera | Desi Kunsa | Still Photographer |
| Crew | Piotr Wojtkowski | Stunt Coordinator |
| Crew | Zbigniew Modej | Stunts |
| Costume & Make-Up | Emil Wysocki | Costume Assistant |
| Crew | Paweł Kowalski | Stunts |
| Crew | Marcin Kurowski | Public Relations |
| Crew | Aleksandra Misiak | Public Relations |
| Sound | Michał Bagiński | Sound Director |
| Art | Konrad Krysiak | Assistant Property Master |
| Art | Piotr Furman | Assistant Property Master |
| Costume & Make-Up | Zuzanna Żurawska | Costume Assistant |
| Crew | Bartłomiej Kowalski | Acting Double |
| Visual Effects | Filip Kaczorek | VFX Supervisor |
| Art | Jan Kołodziej | Assistant Production Design |
| Crew | Julia Bui Ngoc | Choreographer |
| Editing | Jason Merle | Assistant Editor |
| Crew | Karol Zagórski | Public Relations |
| Sound | Miłosz Jaroszek | Sound |
| Crew | Karolina Pilarczyk | Stunts |
| Crew | Ryszard Kluza | Catering |
| Production | Aleksandra Cyganek | Production Manager |
| Crew | Aleksandra Karbowiak-Dajewska | Public Relations |
| Crew | Nathaniel Espino | Translator |
| Crew | Tomasz Kędzior | Stunts |
| Crew | Paweł Latos | Stunts |
| Crew | Wojciech Konkol | Health and Safety |
| Sound | Filip Krzyżykowski | Sound Effects Editor |
| Costume & Make-Up | Zuzanna Zakrzewska | Assistant Makeup Artist |
| Crew | Michał Basiński | Catering |
| Production | Agata Sieradzka | Assistant Production Manager |
| Production | Aleksandra Orzechowska | Production Coordinator |
| Production | Agnieszka Sieradzka | Executive Producer |
| Production | Alois Rostek | Co-Producer |
| Production | Kamil Rutkowski | Co-Producer |
| Production | Michał Krajewski | Co-Producer |
| Production | Marcin Kasiński | Co-Producer |
| Production | Tomasz Grzybowski | Co-Producer |
| Production | Jolanta Surgiewicz | Accountant |
| Production | Krzysztof Gawrysiak | Co-Producer |
| Production | Maciej Mika | Co-Producer |
| Production | Andrzej Hajdaniak | Co-Producer |
| Crew | Ewelina Pawlus | Script |
| Production | Agnieszka Sieradzka | Producer |
| Art | Maciej Mika | Main Title Designer |
