Emmerdale spoilers follow from Wednesday's episode (2 July), which is available to watch now on ITVX and YouTube but hasn't yet aired on ITV1.
Emmerdale's Moira Dingle reflects on the heartbreaking death of her daughter Holly Barton in tonight's episode.
Moira references Holly's tragic demise as she reads the riot act to Ross Barton and Mackenzie Boyd over their secret drug scheming.
Viewers know that Ross's long-lost brother Lewis has been growing cannabis and selling it to customers who require it for medicinal reasons.
When Ross and Mackenzie got wind of Lewis's secret stash, they couldn't resist getting involved as they pondered ways to make some quick money to save Moira's farm.
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The pair eventually agreed to respect Lewis's wishes when it came to the weed and how it was used, but Robert Sugden has since stepped in to thwart the trio by secretly selling it to newcomer Ray.
In Wednesday's episode, there's trouble at Butler's Farm when Moira finds out about the secret side stash that was kept in one of her barns.
Moira is quick to point out the risks to the farm's future, as well as their family's troubled history with drugs.
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"Holly died of an overdose," Moira reminds Ross and Mack.
"How could you even consider it? There could be another mother out there whose child dies because of the drugs that you started. I mean, how could you do this to me?
"You lied to me, you went behind my back, and you put everything that I'm fighting for at risk. Growing drugs is illegal no matter what the intention."
Will Ross and Mack point the finger at Lewis or keep his name out of it? Fans can find out when the episode airs at 7.30pm tonight, or it's also available to watch right now on ITVX and YouTube.
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Holly died from a drug overdose in 2016. The tragic turn of events was one of Emmerdale's biggest ever shocks, as show bosses kept the storyline tightly under wraps until the episode aired.
Last year, Sophie Powles reprised the role of Holly as part of a special episode which explored Moira's dreams while she was on the operating table to have a brain tumour removed.
Emmerdale airs on weeknights at 7.30pm on ITV1, and streams on ITVX.
Read more Emmerdale spoilers on our dedicated homepage
For more on drug addiction and dependency, including information and support, please visit FRANK or Action on Addiction.
