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 |
| Writing | Piotr Mularuk | Writer |
| Writing | Katarzyna Gacek | Writer |
| Writing | Katarzyna Gacek | Novel |
| Camera | Adam Bajerski | Director of Photography |
| Directing | Konrad Bajno | Assistant Director |
| Camera | Adam Bajerski | Camera Operator |
| Camera | David Bajerski | Camera Operator |
| Camera | Romuald Lewandowski | Camera Operator |
| Lighting | Maciej Chmielewski | Master Lighting Artist |
| Camera | Marcin Brzezek | Grip |
| Camera | Łukasz Zygmunt | Grip |
| Camera | Krzysztof Szulim | Grip |
| Editing | Michał Krajewski | Digital Intermediate |
| Visual Effects | Filip Kaczorek | VFX Supervisor |
| Art | Natalia Giza | Production Design |
| Art | Jan Kołodziej | Assistant Production Design |
| Art | Jakub Kaleta | Assistant Production Design |
| Art | Marcin Łakomy | Props |
| Art | Konrad Krysiak | Assistant Property Master |
| Art | Magdalena Dymińska | Assistant Property Master |
| Art | Mikołaj Makulski | Assistant Property Master |
| Art | Daniel Feliński | Assistant Property Master |
| Art | Sebastian Glinicki | Assistant Property Master |
| Art | Marcin Gloeh | Assistant Property Master |
| Art | Piotr Furman | Assistant Property Master |
| Costume & Make-Up | Dorota Roqueplo | Costume Design |
| Costume & Make-Up | Zuzanna Żurawska | Costume Assistant |
| Costume & Make-Up | Weronika Pietrzak | Costume Assistant |
| Costume & Make-Up | Emil Wysocki | Costume Assistant |
| Costume & Make-Up | Julia Ślusarczyk | Costume Assistant |
| Crew | Julia Bui Ngoc | Choreographer |
| Sound | Miłosz Jaroszek | Sound |
| Sound | Kacper Habisiak | Sound |
| Sound | Kacper Habisiak | Sound Director |
| Sound | Michał Bagiński | Sound Director |
| Sound | Ewa Wrzesińska | Dialogue Editor |
| Sound | Filip Krzyżykowski | Sound Effects Editor |
| Editing | Jason Merle | Assistant Editor |
| Costume & Make-Up | Marta Tesche-Klimek | Makeup Department Head |
| Costume & Make-Up | Zuzanna Zakrzewska | Assistant Makeup Artist |
| Costume & Make-Up | Ewelina Krzywda | Hairdresser |
| Crew | Joanna Jakubik | Public Relations |
| Crew | Aleksandra Karbowiak-Dajewska | Public Relations |
| Crew | Marcin Kurowski | Public Relations |
| Crew | Aleksandra Misiak | Public Relations |
| Crew | Karol Zagórski | Public Relations |
| Camera | Desi Kunsa | Still Photographer |
| Crew | Nathaniel Espino | Translator |
| Crew | Piotr Wojtkowski | Stunt Coordinator |
| Crew | Tomasz Kędzior | Stunts |
| Crew | Paweł Kowalski | Stunts |
| Crew | Paweł Latos | Stunts |
| Crew | Zbigniew Modej | Stunts |
| Crew | Agnieszka Pawłowska | Stunts |
| Crew | Karolina Pilarczyk | Stunts |
| Crew | Mirosław Pisarek | Stunts |
| Crew | Bartłomiej Kowalski | Acting Double |
| Crew | Wojciech Konkol | Health and Safety |
| Crew | Aneta Kielak | Catering |
| Crew | Michał Basiński | Catering |
| Crew | Ryszard Kluza | Catering |
| Production | Aleksandra Cyganek | Production Manager |
| Production | Aleksandra Orzechowska | Production Coordinator |
| Production | Agata Sieradzka | Assistant Production Manager |
| Crew | Ewelina Pawlus | Script |
| Production | Jolanta Surgiewicz | Accountant |
| Production | Agnieszka Sieradzka | Executive Producer |
| Production | Agnieszka Sieradzka | Producer |
| Production | Alois Rostek | Co-Producer |
| Production | Marcin Kasiński | Co-Producer |
| Production | Krzysztof Gawrysiak | Co-Producer |
| Production | Tomasz Grzybowski | Co-Producer |
| Production | Kamil Rutkowski | Co-Producer |
| Production | Michał Krajewski | Co-Producer |
| Production | Maciej Mika | Co-Producer |
| Production | Andrzej Hajdaniak | Co-Producer |
| Art | Maciej Mika | Main Title Designer |
