A new BBC drama that has caused havoc amongst the fans since the date it started airing its first episode is already up for the 4th episode. Martin, who starred in Line of Duty is the main lead in the show, has again delivered one of the best performances in this drama.
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ToggleAir Date of Episode 4
The fourth episode will be aired on Sunday, September 12th, at 9:00 PM on BBC 1. The following episodes of the series will be aired every Sunday at 9:00 PM on BBC One and BBC iPlayer only. While fans might be wondering that the first two episodes were released closely, just to burst the excitement bubble, these two episodes were added close enough so that they can captivate the audience and hook them to the screens for the other episodes to come.
BBC Episode Schedule
As already mentioned, the series will be aired every Sunday at 9:00 PM to keep up the excitement amongst the fans. The show has six episodes in total and was shot during stage one of the pandemics in one go; while there were some problems encountered during the shooting but it was resumed soon in Glasgow. Most of the show was shot in Scotland. The length of the show is one hour for each episode.
Plot for 4th Episode

All the fans who are following the story might know about the plot until now, and to continue the same, the excitement level will remain high in the 4th episode. Kirsten being captured by the killer will reveal the grave threats. Vigil has, while she will be saved, but on the other side, Amy, who is on a submarine, will be discovering some hidden truths.
Trailer for the Show
The BBC released a trailer for the new show where Suranne Jones DCI Silva is seen entering a submarine in problematic circumstances and trying to uncover the mysterious things that are happening in the submarine. She tries to uncover the story behind the murder and the suspects amongst the crew members and who seems responsible for the same.
The Cast of the Show

Suranne Jones and Rose Leslie are seen as the main leads in the show. Martin Compston, from the line of duty actor, is also a part of the cast, while Stephen Dillane, Lolita Chakrabarti, Daniel Portman, Lorne Macfadyen, and Stephen McCole are also part of the same.
The Plot of the Show
Amy Silva is called upon to find a link between the unusual disappearance of a fishing boat and death in a submarine. The two incidents caused chaos amongst the Navy and the British security services, thus pressuring for a clear investigation.
Amy Silva, who was supposed to be on vigil for three days, ends up getting caught while uncovering the truths and asking for Kirsten’s help. Going by the Navy protocols, these two can’t communicate directly and thus are doing so by heavily monitored telegrams, while these two end up hiding information from the Navy.