Killer teenager Lachlan – who is played by Thomas Atkinson – murdered his mother Chrissie and grandfather Lawrence in a car crash in a fit of psychotic rage last year and now Gerry knows how.
During the crash, which also left his aunt Rebecca with brain trauma and memory loss, Lachlan accidentally left a voicemail of him telling his family he was going to kill them.
But after deleting the voicemail from Gerry's phone, he thought he was free and easy.
Now Gerry has found the missing voicemail and listened to it in horror, and with the news there will be a shock death in the village next week, fans are convinced the time is up for Gerry.
One wrote: "Lachlan did it with a candlestick in the library! Poor Gerry #EmmerCluedo"
A second tweeted: "Of course it’s Gerry. He’s found out Lachlan secret. He has to go."
Another added: "Oh ye of course Lachlan will kill Gerry then the building falls down and everybody will blame Doug for killing Gerry your so right."
In a spoiler trailer from ITV, Gerry confronts Lachlan and is left in a perilous position.
"You need to tell Rebecca this," Gerry tells Lachlan in a scene from the trailer with the murderer refusing.
Later he is seen meeting Lachlan on a building site and being convinced to go into a seemingly dangerous place.
The trailer ends with Gerry screaming for help as Lachlan sits upset with his head in his hands.
But will Lachlan go as far as to murder his best friend to keep his killer secret?
Or will he finally confess to what he has done to his aunt and accept the consequences?
The special episode will air on May 17.
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