When Norman Graysmith is invited into the home of an aspiring serial killer, Aidan Mendle, he believes he has the subject for the documentary that will make his career.
| Actor | Role |
|---|---|
| EEd HartlandAidan | Aidan |
 Jared RogersNorman | Norman |
| KKaitlin ReynellClaire | Claire |
 Octavia GilmoreAmy | Amy |
 Kavé NikuMasoud | Masoud |
 Ronja HaugholtVeronika | Veronika |
 Vår HaugholtViktoria | Viktoria |
 Yasen AtourJack | Jack |
 Katharine Bennett-FoxJulia | Julia |
 Lee Nicholas HarrisPolice Officer PCSO | Police Officer PCSO |
| CCaroline ColomeiMrs. Kitson | Mrs. Kitson |
| LLouise Ann MunroSharon | Sharon |
| SSibylla MeienbergEmma | Emma |
| SSteve HodgettsMalcom | Malcom |
| EEvelyn LockleySara | Sara |
| SStuart VincentTerry | Terry |
 John-Christian BatemanDonald | Donald |
| SSiu-see HungImogen | Imogen |
| AAileen GonsalvesJo | Jo |
| KKarl SedgwickRory | Rory |
| PPatrick MarleyPatrick Button | Patrick Button |
| AAndreina SambucettiPCSO | PCSO |
| BBella FarrHenrietta | Henrietta |
| PPhil RossHuw | Huw |
| AAngela Jane SayersPolice Officer | Police Officer |
| JJay Oliver YipRoger | Roger |