The 4 deaths in this episode (one from the past) bring the total in the series to date to 144.
This episode was watched by 7.8 million people when it was shown in the UK on October 9, 2005. This constituted an audience share of 33% between 9pm and 11pm, and was a winner in the ratings.
This episode introduces Barnaby's new Sergeant - Sergeant Jones, who we first meet when he is a Constable. John Hopkins (Sergeant Scott) decided to leave the series, and his replacement is played by Jason Hughes, probably best known for his role as Warren (the gay guy) in the BBC-series This Life.
The murder victims:
1. Peter Cave - Garotted with piano wire
2. Caroline Cave - Garotted with panio wire
3. Harriet Davis - Garotted with panio wire
N/B - An extra historical death is that of PC Colin Armstrong; shot
The House in the Woods is based on a thriller by James Herbert. Producer Brian True-May said in 2004 that he wanted to do what he loved doing to audiences - make them exercise their imagination. He knew it wouldn't be easy to film this story, but that it had been in development for six-seven years.