WHITE House Farm has got viewers hooked with it's tale of how one man slaughtered his entire family.
But it's killer Jeremy Bamber's pal Brett Collins, played by Alfie Allen, that has got fans intrigued.
Who is Brett Collins on White House Farm?
Jeremy Bamber befriended New Zealand native Brett Collins when he was living in the country between July to October 1983.
Collins was in Greece when he heard about the Bamber murders and immediately travelled to England.
He travelled with Bamber to London where they stayed at Jeremy's dead sister Sheila's old flat and sold the family antiques round the salerooms.
Not much more is known about Collins after Bamber's arrest.
Who is Alfie Allen?
Alfie takes on the role of the mysterious Brett in ITV drama White House Farm.
The 33-year-old actor is best known for playing Theon Greyjoy in Game of Thrones from 2011 until it ended in 2019.
Allen was born in Hammersmith in London and is famously the son of film producer Alison Owen and actor Keith Allen.
Who is Alfie Allen dating?
Alfie famously dated Ray Winstone's daughter Jamie from 2007 to 2010 - they even got engaged.
He was then in a relationship with American DJ and model Allie Teilz from 2017 to 2019.
The former couple welcomed their daughter Arrow in October 2018, but split in April 2019.
Alfie is now dating up-and-coming artist Antonia Showering.
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What has Alfie Allen starred in?
Alfie's early work included small roles in movies like Agent Cody Banks 2: Destination London, directed by his uncle Kevin Allen and Atonement.
Apart from starring in TV show Game of Thrones, Alfie has continued to work in films starring in Soulboy, The Kid, Freestyle and Powder.
In 2019 he starred in quirky movie JoJo Rabbit.