The BBC has reportedly already begun talks for a potential second series of its new drama thriller Vigil.
The show stars Suranne Jones as a detective who is sent on board a submarine to investigate the murder of one of the crew in mysterious circumstances.
Vigil launched over the Bank Holiday weekend with two episodes, drawing over 5 million viewers in the overnight ratings - although those figures are likely to rise significantly when catch-up viewing is taken into account.
"The Beeb knew they had a hit on their hands," a source told The Sun. "So they've been in discussion for some time with its creators, World Productions, about a potential follow-up.
"Now those plans are likely to progress at speed, with a view to Vigil II being commissioned.
"It remains to be seen whether Suranne will return, as Vigil's makers aren't afraid to kill off a central character."
Vigil continues Sunday at 9pm on BBC One.
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