Described as a cat and mouse thriller, the drama follows former detective Huw Miller (Watkins), who is living with the regret of failing to catch the so-called Ripton Stalker. That is until Patrick Harbottle (Green) moves in next door, and Huw begins to think Patrick is his man.
As Patrick gets ready to play, he is met with a flurry of questions from Huw before they play a game of 20 questions, and things turn eerie very quickly.
"It must be awful living with that. Not knowing who he is, where he is, what he's doing. That would drive me crazy!"
You can watch the full clip above.
"The way Patrick says 'catch you later' triggers something within Huw, who thinks he has his man," Green told the publication.
He continued: "The amazing thing that plays out in this series is the capitulation of Huw, played beautifully by Jason, and whether Patrick is just a friendly guy concerned about his welfare, or if he is psychologically torturing him."
The four-part series begins on Monday 12th May at 9pm on 5, and will air across consecutive nights until the finale on Thursday 15th May.
Check out more of our Drama coverage or visit our TV Guide and Streaming Guide to find out what's on. For more from the biggest stars in TV, listen to The Radio Times Podcast.
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