The BEST episodes of Silent Witness season 21

Every episode of Silent Witness season 21, ranked from best to worst by thousands of votes from fans of the show. The best episodes of Silent Witness season 21!

Forensic pathologists face personal and professional challenges in a moody, tense thriller that moves from the crime scene to the lab.

Last Updated: 7/23/2025Network: BBC OneStatus: Continuing
Family (2)
star
7.86
208 votes

#1 - Family (2)

Season 21 - Episode 10 - Aired 2/7/2018

With the conclusion of a challenging Christmas, the team are reunited with their families. Nikki learns that her colleagues have bought her a present.

Directors: Colin Teague
Watch Now:AmazonApple TV
Family (1)
star
7.44
221 votes

#2 - Family (1)

Season 21 - Episode 9 - Aired 2/5/2018

Nikki, Jack, Thomas and Clarissa are just settling down for their respective festive celebrations when they are interrupted by a call-out to a tragedy at a family home.

Directors: Colin Teague
Watch Now:Apple TV
A Special Relationship (1)
star
7.40
249 votes

#3 - A Special Relationship (1)

Season 21 - Episode 5 - Aired 1/22/2018

A US diplomat is shot dead in central London, forcing the team to work closely with the embassy and the FBI.

Directors: Diarmuid Goggins
Watch Now:Apple TV
A Special Relationship (2)
star
7.38
220 votes

#4 - A Special Relationship (2)

Season 21 - Episode 6 - Aired 1/23/2018

When analysing crime scene photos and the positions of the victims' bodies, the team uncover a secret.

Directors: Diarmuid Goggins
Watch Now:Apple TV
Moment of Surrender (2)
star
7.34
232 votes

#5 - Moment of Surrender (2)

Season 21 - Episode 2 - Aired 1/9/2018

Nikki's suspicions about David Cannon are aroused further when she discovers blood in the boot of his car.

Directors: Charles Palmer
Writer: Ed Whitmore
Watch Now:Apple TV
Moment of Surrender (1)
star
7.19
267 votes

#6 - Moment of Surrender (1)

Season 21 - Episode 1 - Aired 1/8/2018

The team investigate the death of a man found in a reservoir. Nikki and Jack deal with the aftermath of their Mexico trip.

Directors: Charles Palmer
Writer: Ed Whitmore
Watch Now:Apple TV
One Day (2)
star
7.08
215 votes

#7 - One Day (2)

Season 21 - Episode 8 - Aired 1/30/2018

The team continue to investigate the truth around the care home deaths. Clarissa's determination to find out the shocking truth puts her life in danger.

Watch Now:Apple TV
One Day (1)
star
6.95
215 votes

#8 - One Day (1)

Season 21 - Episode 7 - Aired 1/29/2018

After a fatal traffic accident, suspicion falls on a care home resident, but is the suspicion justified?

Watch Now:Apple TV
Duty of Candour (2)
star
6.78
223 votes

#9 - Duty of Candour (2)

Season 21 - Episode 4 - Aired 1/16/2018

The team wonder if the hack is the only danger as they come under threat. Jack has to decide how to get closure from his experience in Mexico.

Directors: Destiny Ekaragha
Watch Now:Apple TV
Duty of Candour (1)
star
6.69
239 votes

#10 - Duty of Candour (1)

Season 21 - Episode 3 - Aired 1/15/2018

A series of tragic events are linked to the hacking of a hospital database and the subsequent blackmailing of patients.

Directors: Destiny Ekaragha
Watch Now:Apple TV