After Zoe?s death and best friend Ian Reed?s betrayal, Luther spent some time working on cold cases. Now he?s back. His old unit has gone and he?s working in the newly created Serious and Serial unit. Headed by former police complaints officer Martin Schenk, it is Luther?s chance for a fresh start, but is it one he really wants?
Luther quickly gathers together his team, rescuing his old partner Detective Justin Ripley from career oblivion. Joining them is ambitious Detective Erin Gray. She?s heard of Luther?s reputation, seen what?s happened to Ripley and doesn?t want her own job prospects tarnished in the same way.
It?s not long before they?re dealing with their first case. A masked man wanders the streets of London, carrying out ritualistic murders in historic locations ? Smithfield, Petticoat Lane? He?s taking Luther on a tour through the narrow alleyways and back streets of the city, using murders to mark out his territory and working up to one final masterpiece.
This series sees Luther take bigger risks and face even darker challenges.