Code of a Killer (Season 1)

Code of a Killer (2015) is a British two-part drama you can watch online on iFILM — directed by James Strong, starring David Threlfall as geneticist Alec Jeffreys and John Simm as Detective Chief Superintendent David Baker.

It's the mid-1980s in Leicestershire. Jeffreys is working out how to pull a unique biological signature from a DNA sample — what he'll call genetic fingerprinting. Across the county, Baker is stuck: a double murder, no physical match, and a community that's frightened. The series runs both tracks in parallel until they converge in a criminal court — the first conviction in history built on DNA evidence.

The storytelling is restrained. No dramatised revelations, no shortcut dramatics. Just two careful men doing difficult work. That restraint is exactly why the outcome lands. Stream Code of a Killer online on iFILM.