Witness Number 3: next episode, cast, plot, and everything we know

Witness Number 3 cast
Witness Number 3 is a gripping new Channel 5 thriller. (Image credit: Channel 5)

Witness Number 3 is coming to Channel 5, with the four-part series set to be the channel's next gripping crime drama. 

The new thriller follows a woman named Jodie, a single mum who runs a hairdressing salon. But one day, everything changes as she becomes an important witness in a murder case.

The series was written by upcoming screenwriter Thomas Eccleshare and Diarmuid Goggins (Silent Witness, Bulletproof) is the director.

Here's everything we know so far...

Witness Number 3 release date

Witness Number 3 was released on Channel 5 at 9 pm on Monday, July 18. The rest of the series will air at the same time on consecutive nights, finishing on Thursday, July 21. There’s currently no US release date.

Episodes will also be able to watch on demand via My5.

What is the plot of Witness Number 3?

The official plot for Witness Number 3 is: A split-second look means the life of single mum Jodie is about to go into free fall. Unwittingly, she’s the last person to witness a killer and his victim before he’s murdered. 

"After responding to a police appeal, Jodie is told her identity will be kept anonymous. And then it becomes clear why... She’s subjected to a terrifying campaign of intimidation by a gang sent to silence her, and they will stop at nothing to protect their accused boss. This claustrophobic psychological thriller asks: How far are you prepared to go to do the right thing?"

Who's in the cast of Witness Number 3?

Bodyguard star Nina Toussaint-White leads the cast as Jodie. Sion Daniel Young (Deceit) plays P.C Ivan Barkas, who is assigned to protect Jodie when she becomes the significant witness. 

Clare Dunne (Kin) stars as Detective Whelan, an officer investigating the murder. Ruaridh Mollica (Stonemouth) is Po, one of the local gang members terrorizing Jodie and her family.

Finally, Sue Johnston (The Royle Family) is Jodie’s mother Cathy, with whom she has a close-knit relationship and newcomer Cole Martin is Kyle, Jodie’s son.

Is there a trailer?

Yes, a short teaser trailer has been released and you can watch it below. It's quite ominous and there's not much to give the game away, but it's a pretty gripping teaser nonetheless!

An exclusive first clip was shared via Radio Times too, which you can watch here.

What happened in episode one?

In the first episode of Witness Number 3, we follow single mum and salon owner Jodie Packer (Nina Toussaint-White), whose life is turned upside down when she’s targeted by a violent gang after she witnesses a murderer and his victim moments before the killing took place.

Jodie heads to the station in the early moments of episode one, where she goes over her statement with a police officer and learns her name and address has been removed. She asks why, but is dismissed and told the process is "very common" and she's simply known as "Witness Number 3".

She tries to continue on with her day job as normal, running her salon and being a mother to her son, but her life is soon in danger after the gang launches a terrifying campaign of intimidation against her for going to the police.

Jodie encounters a young man outside a housing estate, who claims he needs to use her phone to contact his brother as he’s been locked outside his flat. After apparently getting no response he gives the phone back, and watches Jodie and her son for a moment before walking off.

Later, a call comes into the hair salon but no one answers the phone, which only adds to Jodie’s paranoia following the events of the previous evening before she heads down to the station again where she’s asked to look at a line-up of suspects and say if she recognises any of them. It is later confirmed she identified the same man the police have in custody.

Following this, Jodie is told she has become a “significant witness” and that her statement will be used to help build the case and she meets with PC Ivan Barkas, who is her witness contact, but so far viewers are very suspicious of him.

Jodie begins to receive disturbing videos and sees the gang outside of her salon, causing her paranoia to increase even more but she continues to work with the police, helping to build the case and identify key information.

While at home with her family, Jodie begins to receive more and more threatening messages, including footage of her at home and footage of her walking her son to school, so it becomes clear everyone around her is now in danger... and it's even more upsetting when she finds out her late husband could be linked to gang activity.

 PC Ivan agrees to monitor her flat and breaks the news that the other two witnesses "are out" and can't be used, but could that put her in more danger?

The episode ends with the gang completely trashing Jodie's salon, but it's clear that's just a warning and they're prepared to do much more than that...

Lucy Buglass
Senior Staff Writer

Lucy joined the WhatToWatch.com team in 2021, where she writes series guides for must-watch programmes, reviews and the latest TV news. Originally from Northumberland, she graduated from Oxford Brookes University with a degree in Film Studies and moved to London to begin a career writing about entertainment.


She is a Rotten Tomatoes approved film critic and has a huge passion for cinema. She especially loves horror, thriller and anything crime-related. Her favourite TV programmes include Inside No 9, American Horror Story, Stranger Things and Black Mirror but she is also partial to a quiz show or a bit of Say Yes to the Dress