Tijdens de zomervakantie gaan de drie vrienden samen op reis naar Roemenië, waar ze stage mogen lopen op de filmset van "Dracula Rises", voor hen geregeld door Peters vader, die verantwoordelijk is voor de special effects tijdens de opnames. Ze zijn nog maar net in Transsylvanië aangekomen of de mysterieuze gebeurtenissen beginnen zich op te stapelen in het oude kasteel van gravin Codrina, dat dient als de originele setting voor de film. De drie detectives willen uitzoeken wat dit alles te maken kan hebben met een jongen die al meer dan 50 jaar vermist is, een mysterieuze broederschap en een raadselachtige ondode.
Nee, helaas is Die drei ??? - Erbe des Drachen nog niet beschikbaar op Netflix in Nederland.
| Production | Martin Bachmann | Producer |
| Art | Marius Bardasan | Leadman |
| Crew | Ionut Dobrescu | Assistant Picture Car Coordinator |
| Directing | Stefania Maftei | Second Assistant Director |
| Production | Sofie Scherz | Line Producer |
| Production | Lisa Tretrop | Line Producer |
| Art | Celina Hollaender | Art Direction |
| Sound | David Reichelt | Music |
| Costume & Make-Up | Margo Stefan | Key Hair Stylist |
| Art | Iulian Bostănaru | Art Direction |
| Production | Mara Fiedler | Producer |
| Production | Max Wiedemann | Producer |
| Production | Daniela Tolkien | Casting |
| Production | Ayhan Üsük | Production Manager |
| Costume & Make-Up | Frauke Pira | Makeup Department Head |
| Production | Valentino Rudolf | Line Producer |
| Directing | Cristina Iliescu | First Assistant Director |
| Costume & Make-Up | Svenja Gassen | Costume Design |
| Production | Justyna Müsch | Producer |
| Crew | Catalin Varga | Picture Car Coordinator |
| Art | Andreea Popa | Set Decoration |
| Art | Vraciu Eduard Daniel | Art Direction |
| Production | Oliver Lüer | Production Manager |
| Art | Bianca Micu | Assistant Set Decoration |
| Production | Quirin Berg | Producer |
| Production | Johanna Bergel | Producer |
| Art | Josef Brandl | Production Design |
| Crew | Daniel Rohm | Post Production Supervisor |
| Production | Stefan Gärtner | Co-Producer |
| Production | Adrian Pavelescu | Unit Production Manager |
| Sound | Christoph Oertel | Foley Mixer |
| Sound | Matthias Schmidt | Dialogue Editor |
| Visual Effects | Tonio Freitag | 3D Artist |
| Camera | Bogdan Stanciu | "B" Camera Operator |
| Crew | Georg Wesch | Production Intern |
| Visual Effects | Florian Ast | Visual Effects Supervisor |
| Visual Effects | Stefan Müller | Digital Compositor |
| Visual Effects | David Schuster | Digital Compositor |
| Production | Aleca Ivan | Production Coordinator |
| Visual Effects | Vanessa Foermer | Animation |
| Camera | Andrei Zikieli | First Assistant Camera |
| Sound | Martin Langenbach | Foley Artist |
| Camera | Bogdan Stanciu | Steadicam Operator |
| Editing | Sam Pluemacher | Assistant Editor |
| Lighting | Cristian Iacob | Electrician |
| Costume & Make-Up | Simona Alecu | Set Costumer |
| Camera | Antonio Diaz Gallardo | Key Grip |
| Directing | Nina Kötter | Script Supervisor |
| Costume & Make-Up | Ciresica Cuciuc | Costume Supervisor |
| Production | Catalin Dobre | Production Assistant |
| Art | Bogdan Voiculescu | Graphic Designer |
| Sound | Jürgen Göpfert | Sound Mixer |
| Visual Effects | Christopher Hummel | Digital Compositor |
| Lighting | Mihai Granaru | Electrician |
| Camera | Zsolt Tofán | Second Assistant Camera |
| Visual Effects | Jakob Kardoeus | Digital Compositor |
| Sound | Dana Hopfe | ADR Supervisor |
| Visual Effects | Sebastian Nozon | Visual Effects Supervisor |
| Camera | Ionita Valeriu-Mihai | Key Grip |
| Camera | Marian Bugeac | Grip |
| Lighting | Lucian Diaconu | Gaffer |
| Lighting | Vasile Dodu | Best Boy Electric |
| Crew | Jonathan Roth | Post-Production Manager |
| Production | Sabina Rudolf | Producer's Assistant |
| Visual Effects | Knuth Möde | Matte Painter |
| Editing | Markus Baburske | Colorist |
| Visual Effects | Claus Lunt | Digital Compositor |
| Lighting | Adrian Dobre | Electrician |
| Costume & Make-Up | Bastian Stein | Assistant Costume Designer |
| Writing | André Marx | Novel |
| Camera | Holger Jungnickel | Director of Photography |
| Writing | Anıl Kizilbuga | Writer |
| Writing | Tim Dünschede | Writer |
| Directing | Tim Dünschede | Director |
