Spoiler for sweetiepie
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Gennie sneaked into Debbie's house to try and find proof that Debbie and Cameron were having an affair.
She managed to record Cameron confessing to murdering Carl King and using it as some sort of proof that he loved Debbie and that they should be together, given that she had recently tried to murder Chas.
And it worked because Debbie said she still loved him and they kissed a lot.
They left the house together and Gennie sneaked out but they saw her and chased her. She inexplicably decided to get in the car and drive away through a deserted village rather than run over the road to the packed pub and get help.
Debbie and Cameron chased her, she lost control of the car and rolled it down a massive hill, turning over and over and hitting about a million trees on the way down.
She was alive but seemed paralysed when Cameron ran down the hill to 'rescue' her, leaving Debbie out of sight on the road calling for an ambulance.
When he realised she was still alive but unable to move he put his hand over her mouth and nose and suffocated her to death to stop her telling anyone what she overheard.
Then Debbie ran down the hill, thought she had died from her injuries, and cried.
And that was the end.