Harlan Coben appears in episode 9 as the maitre'd in the restaurant.
The scenes in the woods and the Bear Pit are filmed at Eastham Country Park, Eastham, Wirral.
The series was first broadcast in France in 2016 on pay-TV channel Canal+ and then a year later on national broadcaster France 3. However the ratings for the wider airing were not up to the channel's expectations and the show was pulled from prime time after two weeks, the remaining episodes burned off in early morning time slots.
The Windsor Lockwood clinic refers to Windsor Horne Lockwood III, a character from Harlan Coben's Myron Bolitar series.
The scenes from Episode 8 where Slade breaks into The Clarke house are filmed in Port Sunlight on the Wirral