Fiz (Jennie McAlpine) has been inhaling deadly carbon monoxide fumes due to her faulty boiler in recent days, but she remains blissfully unaware of the dangers as her symptoms worsen in tonight's double bill.
When Fiz finally loses consciousness, it's her secret lover Tyrone Dobbs (Alan Halsall) who eventually finds her.
Tyrone knows that he has to get Fiz to safety, but can he manage to help her without his violent fiancée Kirsty Soames finding out about his affair?
Coronation Street airs tonight at 7.30pm and 8.30pm on ITV1.
> Corrie's Jennie McAlpine: 'Carbon monoxide story already saving lives'
> Read our spoiler for tonight's first 'Coronation Street' episode
> Read our spoiler for tonight's second 'Coronation Street' episode
> Read more 'Coronation Street' spoilers and news