BBC One's latest thriller The Control Room has already confused and intrigued viewers after just one episode, which was packed with unexpected twists and turns.
The series sees ambulance call handler Gabe plunged into a dangerous mystery linked to his hidden past when he takes a strange call at work one day.
Read more: Who stars in The Control Room?
But where is the drama set, when is it next on TV and how many episodes are there?
How many episodes are in The Control Room?
BBC One series The Control Room is a three-part drama.
The first episode aired on Sunday, 17 July and is available to catch up with on BBC iPlayer.
When is The Control Room next on TV?
The series is full of plot twists and mysteries that keep viewers hooked, and the good news is that you won't have long to wait to find out how the story unfolds.
BBC One is stripping the series across three consecutive nights – so the second episode will air on Monday, 18 July at 9pm and the third and final episode will air on Tuesday, 19 July at 9pm.
All three episodes will be available to watch on iPlayer after they have aired.
Where is The Control Room set?
Gabe's story takes place in Glasgow, in the city's ambulance control room, and the series was made with the support of Creative Scotland.
It's a modern-day drama set in the Strathclyde Ambulance Service which takes in many recognisable locations for those familiar with Glasgow.
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The control room used in the episodes should look particularly realistic as it was set up in an old police station control room.
Other locations to look out for include city centre sites such as Rose Street, as well as some scenes filmed further out near Stirling.
The Christmas tree farm central to the plot is a real location, too –- although the production, which filmed in summer and autumn 2021, was there out of season.
Iain De Caestecker, who stars as Gabe, said: "There is something about going home that you feel a bit more at ease there. I spent some time before that filming in America, which I really loved, it had been a really cool experience.
"But out there, there can be more of an emphasis on being an actor off screen rather than on screen sometimes, and all the other stuff that comes along with it. And being back to Scotland there's just zero pretentiousness, and I just find it's a really, really down to earth place."
His co-star Joanna Vanderham who plays Sam added: "Working in Glasgow for me is a dream because my mum looks after my dog and I get to go and see my dog every weekend. But the crew in Scotland at the moment is just… the bar’s been raised since I was last there for sure because we have a lot of productions filming there.
"I think it's a lovely opportunity to get to show off how beautiful Scotland is and the people that are there. It's a show that is centred on real people in an extraordinary situation and I think that's mirrored in the casting and I think that's mirrored in the locations that have been used."
Watch: The Control Room trailer