He's a character I play in a RPG inspired by the novel Ragdoll, by Daniel Cole.
In our context, Wolf is free from every suspicion and left the Met after the case Ragdoll.
He spent 2 years fighting depression, and now a new killer, with the same design, is back. Emily asked him to take part in the investigation as she can't take this alone.
It's her name which is on the death list this time.